Yogi's Treasure Hunt is an animated television series as well as the fourth incarnation of the Yogi Bear series. It premiered in 1985 as a part of The Funtastic World of Hanna-Barbera. Yogi and his friends search for treasure across the world, travelling in the S.S. Jelly Roger. Dick Dastardley and Muttley would try to beat them to the treasure.
Yogi and the Unicorn (S01E07)
A witch casts a spell on Yogi for munching on her gingerbread house, causing him to eat whatever he comes across in the forest, swelling bigger until he was fit to burst.