Board Thread:Online Discussion/@comment-13199219-20130807150831/@comment-3076045-20140511112551

Wabbajack and Horripilation appear in the game, yes. But only during the quest, and even if you go back to Tamriel, you can't use them there.

As I said before, they might have them as extremely rare item drops. (like the "unique item" drops for creatures - see the Achievements page for examples) - but for now, they aren't.