Characters and actors who have served as doppelgänger to Kermit the Frog in Muppet productions.

Picture Impersonator / Production Notes
Sesame Street sketch "The Cursed Prince"
Grover narrates a fairy tale starring Maria as a princess and David as a prince with a curse that can only be broken by Maria's kiss, which turns him into Kermit the Frog.
April Fools SSmag76 - Snuffy as Kermit
Mr. Snuffleupagus
Sesame Street Magazine, April 1976
Snuffy stands in for Reporter Kermit in an April Fool's Day spread illustrated by Joe Mathieu.
Robot Kermit
The Muppet Show episode 104
A robot built to look and act like Kermit, to take the place of Kermit the Frog. The robot version had a key on his back, and openly showed affection for Miss Piggy.
Peter Ustinov
Peter Ustinov
The Muppet Show episode 112
During the closing curtain call, Peter confesses to Kermit that he's always wanted to be a frog, and imitates Kermit saying good night to the audience.
Rich Little
The Muppet Show episode 204
In his opening act, Rich impersonates Kermit, Fozzie, Piggy and Statler. Kermit is astonished by Rich's impression: "I was in the dressing room and I heard you on stage, and for a second I thought I had grown a new me."
Evolving Phoob 3
Koozebanian Phoob
The Muppet Show episode 205
The Phoob is the tastiest creature on the planet Koozebane, but Phoobs survive by "evolving" very quickly to blend in with other creatures. Before Kermit's astonished eyes, the Phoob transforms into a Kermit duplicate. "It's called the survival of the trenchcoated," the Phoob explains.
Lenny the Lizard
Lenny the Lizard
The Muppet Show episode 208
Lenny auditions for the job of an emcee, imitating the show's standing host just a little too closely for Kermit's comfort.
Kermit the Pig
The Muppet Show episode 224
When the theater is taken over by pigs, this green pig with bulgy eyes and a spiky collar impersonates Kermit while the real Kermit is held prisoner.
The Swedish Chef
The Muppet Show episode 314
When Dr. Strangepork's dissolvatron malfunctions, Kermit the Frog ends up trading bodies and voices with the Swedish Chef.
Danny Kaye
The Muppet Show episode 316
In a quiet moment between guest and host, Danny confesses that he's begun to talk like Kermit, who acknowledges that he approves of his impression.
The Muppet Show episode 406
In a tribute to Kermit's birthday, the cast sings "Be a Frog".
The Muppet Show episode 406
A cow sings a line of "Be a Frog".
The Muppet Show episode 406
A horse also chimes in on "Be a Frog".
Miss Piggy
The Muppet Show episode 406
Piggy rounds out the finale of "Be a Frog" and appears backstage in her Kermit getup.
Kermit the Protozoa
The Muppet Show episode 409
A a single-celled organism stands in for Kermit's role when Sam the Eagle peers through a microscope.
Robin the Frog
The Muppet Show episode 410
With his Uncle Kermit "falling down on the job", Robin introduces Kenny's number "The Gambler" by waving his arms and shouting "yay!"
Miss Piggy
The Muppet Show episode 410
Kermit is temporarily on crutches, so Miss Piggy assists with his introduction by waving her arms and yelling, "Yaaaaaay!"
Mark Hamill
The Muppet Show episode 417
When Kermit is looking for a guest star he asks Mark what he can do. Mark, doing a Kermit impression, says he can do impressions. Kermit, oblivious to the fact he was being mimicked, asks who he does. Mark goes on to impersonate Fozzie Bear with a similar response.
Kermit Rabbit TMS421
a rabbit
The Muppet Show episode 421
Kermit introduces Doug Henning's final act and a rabbit mimics him as they exit the stage.
Rizzo the Rat
The Muppet Show episode 503
After Kermit lets the rats in as members of The Muppet Show cast, Joan Baez warns that they might try to take over. Indeed, they carry Kermit offstage and Rizzo steps into Kermit's role to say good night.
Mac Davis
The Muppet Show episode 514
Mac Davis passes for a close enough Kermit look-alike, with his green attire and flippers, to attract Miss Piggy as the two sing "Baby Don't Get Hooked on Me." Piggy comments that if he'd just paint himself green, he'd be her kind of guy.
Statler Kermit yay tms517
The Muppet Show episode 517
As co-host of The Muppet Show, Statler introduces a number with Kermit's signature "Yaay!" and arm-flailing.
I'm the one on the right
Fozzie Bear
The Great Muppet Caper
As Kermit's identical twin brother, Fozzie is often mistaken (even by himself) for Kermit. This often happens when he is not wearing his hat.
Green and Pink in the park
Central Park lovers
The Muppets Take Manhattan
After Kermit goes missing, Piggy looks for him in Central Park. Recalling a previous scene in which she'd shared a romantic moment with him in a horse-drawn carriage, Piggy approaches a couple dressed in familiar attire.
Herman the Hoppity-Hop
Sesame Street News Flash
Dr. Nobel Price creates a mechanical automaton fashioned after Kermit.
Plácido Domingo
Night of 100 Stars
Plácido Domingo tries out his Kermit the Frog impression to cheer up a depressed Miss Piggy.
"I'm Gonna Always Love You"
music video
A live frog, evading the prowl of a live pig, wears a Kermit collar in the music video for "I'm Gonna Always Love You."
Jim Henson
"I'm Gonna Always Love You"
music video
Jim Henson wears large Kermit feet in a music video for "I'm Gonna Always Love You." He also sports slim shades and a slicked-back hairdo.
FR209 Kermit
Fraggle Rock "Sir Hubris and the Gorgs"
In Uncle Traveling Matt's postcard, two children go trick-or-treating as Kermit and Miss Piggy.
John Candy
Muppet Magazine Spring 1986
Miss Piggy isn't amused with John Candy's deception in the Easter Parade.
Fay Ray
Sesame Street
In a 1988 episode, Fay Ray is disguised as a frog. Two girls, in voice-over, refer to Fay as "Kermit the Dog."
Gladys the Cow
Sesame Street
Inspired by Kermit, Gladys dresses up as a frog to see what it's like to be someone else.
Don Rickles
Muppets Tonight episode 205
Don Rickles fills in for Kermit on Muppets Tonight by wearing a frog suit, playing the banjo and singing "Bein' Green".
Odyssey Channel promo
A Whatnot addresses an audience reading a script as if he's Kermit. He has Kermit pupils and wears a green, pointed collar.
Topo Sticky
Disney Xtreme Digital
Topo Sticky performs his imitations of Kermit, Gonzo, and Miss Piggy.
Kismet the Toad
The Treasure of Peg-Leg Wilson
Kismet the Toad works for a celebrity impersonators service. He was hired as a Kermit the Frog lookalike -- the only actor of his kind.
Ernie & Bert
Ernie & Bert Märchensongs
Ernie and Bert turned into frogs, closely resembling Kermit, in the narrative of "The Frog Prince."
Miss Piggy
Moviefone's Unscripted
After doing dead-on impressions of Fozzie Bear and Animal, Miss Piggy does a less than accurate impression of Kermit.
The Muppets
Walter dresses up as Kermit the Frog for Halloween.
The Muppets
The Moopets, a Muppet tribute band, employ a Kermit look-alike.
Muppets 1 kermit 1 658912
Players can don a Kermit costume to play through any of the level of the game.
Constantine poster
Muppets Most Wanted
The world's number one criminal bears a striking resemblance to Kermit, and impersonates him for a majority of Muppets Most Wanted.
Club Penguin characters/avatars
Club Penguin
In promotion of 2014's Muppets Most Wanted, costumed avatars will be able to assume the roles of Kermit, Miss Piggy, Animal and possibly more.
Rizzo the Rat
Facebook/Instagram video
In promotion of 2015's The Muppets, Rizzo the Rat used a commercially available Kermit the Frog hand-puppet for his Halloween costume in a social media video. This angers the real Kermit when Rizzo uses the disguse to take Kermit's parking space.
The Swedish Chef
The Muppets episode "Little Green Lie"
The Swedish Chef uses a stalk of broccoli and immitates Kermit while demonstrating the break-up with Miss Piggy to Robin.
Link Hogthrob
"Pigs in Space" video
In "The Gravity of the Situation," as a part of an elaborate April Fool's prank on First Mate Piggy, Link uses a "frog puppet" to pretend to be Piggy's former love, Matt Kewaterski.
Constantine Pentatonix
A Very Pentatonix Christmas
Constantine once again impersonates Kermit in an attempt to ruin his reputation, as he's jealous that he's been reduced to internet memes.
Corden as Kermit
James Corden
The Late Late Show
Corden dresses as Kermit to sing "Rainbow Connection" before he's joined by Kermit himself.

See also