Robin is the nephew of Kermit the Frog. He is very intelligent and kind but often feels unnoticed due to how small he is. He is close friends with Sweetums, who is just as tall as Robin is small.Robin first appeared in the tv special The Frog Prince , where he played a young frog who was formerly a prince. He was also a frequent character on The Muppet Show . His signature song is Halfway Down the Stairs . Since then, he has appeared in a handful of Muppet movies and specials, most notably in The Muppet Christmas Carol , playing the role of Tiny Tim.Appearances in literary Muppet comic books: Muppet Robin Hood (as Squirt), Muppet King Arthur (as Mordred)Performed by Jerry Nelson.