From Muppet Wiki

Four plush dolls were released by Nanco in conjunction with the television broadcast of The Muppets' Wizard of Oz: The Scarecrow, Tattypoo, Tin Thing and The Cowardly Lion.

The plush were exclusive to only one Macy's department store, in New York City, the same location at which window displays for the TV movie could be seen. They have since been sporadically available, like other Nanco plush, in skill machines as prizes.