I few years ago I was very excited to find this Three Bigrees plush on eBay. He's Puddles the Hippo and stands about 7 inches tall. He's not dated (or priced) anywhere, but I would guess early '80s. He's wearing burgundy corduroy pants with faux leather suspenders.
Best of all, he still has his original paper tag:
The back explains the origin of the Three Bigrees: