Board Thread:Questions and Answers/@comment-71.223.191.40-20121228162820/@comment-5584420-20121228172039

I believe Terraformer only changes the Terrain, not Biome, try checking F3, if its written Mushroom biome, the just wait until one mooshroom spawn, but if something else is written at the biome, no luck.

Mooshroom arent really good actually, the best thing from mushroom biome is the mycelium, perhaps making a Cow and mushroom farm if you cant get any mooshroom