Ogre, Ogre is the fifth book of the Xanth series by Piers Anthony.

Smash the ogre goes to see the Good Magician Humfrey to get his question answered, although he doesn't know what his question is. The magician's answer, travel to the Ancestral Ogres to find what you seek. His payment is to guard Tandy, a half-nymph, for one year.

They travel about Xanth, and Smash acquires other young women who travel with him and whom he protects. Along the way, he is infected with the Eye Queue vine, which makes him smart