Having "a frog in my throat" is a common expression referring to the hoarseness of one's voice.
Given the fact that the most famous Muppet character, Kermit, is a frog, the expression has found its way into may productions as a part of a joke.
- In Julie on Sesame Street, Kermit struggles to make it through the opening lines of "Bein' Green" due to laryngitis. He remarks, "Bet you thought I was gonna do the old joke about having a man in my throat, didn't you?"
- In a 1975 appearance on The Tonight Show, Kermit does make the "person in my throat" joke in response to his own. "That's a frog joke, real big with all the frogs out there," he tells Johnny Carson.
- In episode 115 of The Muppet Show, Behemoth visits the clinic for his soar throat. Dr. Bob inspects and discovers he has a frog in his throat - Kermit to be exact.