According to Wikipedia, Kermit the Frog first appeared on May 9, 1955, in the premiere of WRC-TV's *Sam and Friends*. This prototype Kermit was created from a discarded turquoise spring coat belonging to Jim Henson's mother and two ping pong ball halves for eyes.

Initially, Kermit was a vague lizard-like creature. He subsequently made a number of television appearances before his status as a frog was established in the television special *Hey, Cinderella!* in 1969. His triangular-pointed collar was added at the time to make him seem more frog-like and to conceal the seam between his head and body. According to Michael K. Frith, the relatively simple construction of the Kermit puppet allows the performer's arm and hand to produce a wide range of expression and gestures.
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