Frogs Frogs are amphibians featured in many Muppet productions . The best known Muppet frog is , of course , Kermit . Originally designed as an abstract lizard - like creature in 1955 , he was referred to as a frog on several occasions during the late 1960 ' s ( including " The Muppets on Puppets " ) . In following productions ( " Hey Cinderella " , " Sesame Street " ) , he was given webbed feet and a collar , and referred to as " Kermit the Frog " . Muppet Frogs . In 1971 , a group of frogs similar to Kermit - - yet without collars and stripes for pupils - - was built for the TV special " The Frog Prince " . The leading character , a tiny frog named Robin who used to be a prince , would return on " The Muppet Show " as Kermit ' s nephew and became one of the main characters . The other green - and - blue frogs would pop up in various different Muppet productions ; they functioned as a frog chorus / orchestra in " The Muppets Valentine Show " ( 1972 ) , and formed singing groups and a troupe of Frog Scouts on " The Muppet Show " . A group of frogs was also seen in the 1990 special " The Muppets at Walt Disney World " , as Kermit ' s relatives in Paradise Swamp . Their latest appearances included " Billy Bunny ' s Animal Songs " ( 1993 ) and " Kermit ' s Swamp Years " ( 2002 ) . In the latter , they appear as Kermit ' s brothers and sisters , and a separate clan of frogs are seen later in the pet store . One blue frog can be spotted in " The Muppets " . One frog seen in " The Frog Prince " had an eye mechanism which allowed his eyes to bulge . " Sesame Street " . During the first years of " Sesame Street " , frogs were portrayed by green or pink Anything Muppets with bulgy eyes ; during later seasons , more defined frog puppets were used , with a more accurate physique . By the 1980s , some previous frog puppets used in " The Muppet Show " and other productions crossed over and were used on Sesame as well . One four - limbed frog was used as the titular " Caribbean Amphibian " ( Kevin Clash ) . The puppet was also featured in the chorus of musical numbers such as " African Alphabet " and " We Are All Earthlings " ( in both the original and the remake with Jill Scott ) ; and was seen in a sketch with Ernie and Bert ( performed by Joey Mazzarino , speaking only in " nee - deep " s ) . A similar looking frog named Froggy ( after the song " Froggy Went A Courtin ' " ) was seen in the home video " Kids ' Favorite Country Songs " . Other frogs , old and new , congregated in " The Frogs in the Glen . " A toad and a frog were seen in the song " Let ' s Lay an Egg " singing about their egg - laying powers . Real frogs have made appearances on " Sesame Street " ( including one sketch about frogs with Bob and Kermit ) . Elsewhere . Frogs from other Muppet productions include Doc Bullfrog from " Emmet Otter ' s Jug - Band Christmas " ; Bill , Gil and Jill from " The Muppets Take Manhattan " ; Goggles , Croaker and Blotch from " Kermit ' s Swamp Years " ; and a realistic frog that made appearances on " The Animal Show " and " Mopatop ' s Shop " . Real frogs appeared of " Fraggle Rock " . Frog Gallery . " ( This list includes frogs and toads , as in taxonomy , no distinction is made between the two . ) " _ _ NOWYSIWYG _ _