Kermit the Frog is a character created by puppeteer Jim Henson in 1955. He is the protagonist of many Muppet projects, most notably as the host of The Muppet Show, and he has also appeared in various sketches on Sesame Street in the 1970s.
Kermit's most notable connection with The Wizard of Oz was portraying the role of the Scarecrow in The Muppets' Wizard of Oz. However, this was not the first time Kermit had played the role of the Scarecrow or any other Oz character.
Notably, the baby version of Kermit seen on the spin-off show Muppet Babies also portrayed the Scarecrow in the episode "By the Book" and the photo storybook Muppet Babies: Classic Children's Tales.
In addition, a comic story in the Fall 1986 issue of Muppet Magazine featured Kermit dressing as The Tin Woodman.