A Muppet iguana is featured in the opening number, "The Food Chain Song," of The Jim Henson Hour Episode 112 (unaired). Performed by Jerry Nelson, he gets the first sung line, and he launches his tongue to catch a bug before he's devoured by a snake.
The iguana also briefly appears during The Muppets' segment for The Earth Day Special, performed here by David Rudman. He is among the swamp inhabitants, including Kermit and Robin, who discuss the link between pollution and animal extinction.
Years later, the puppet reappeared in crowd shots near the end of the 2011 film, The Muppets.