The Hungry Ogre, referred to only as Ogre in game is found near his campfire in the Area North of Gnoll Stronghold at co-ordinates 400, 920. He starts off friendly, but promises to give you a good fight once he's done eating.
You no bother now, me eat. We fight after me fat-happy.

But if you insist (i.e. talk to him again) he agrees to fight you right away.

Me fight now then! Make you dessert! Pound you to pudding! Mmm, pudding.

Other than the dialog, he's a normal, garden-variety ogre.