In the "Yoshis Wooly World" game you can select from many different...apparently knitted? Yoshis. As a sort of cameo type, one of them has been themed for Sonic, with green eyes, red shoes & Sonic-like patterning applied where the normal Yoshi colors would be. It looks like a little knitted plush. But, does it go any faster than a reuglar one? Want to see it in the game? Youtube Wooly World demonstrates the yoshi designs.