Well, he recruits Orcs - meaning Orc, Veteran Orcs, Orc Trackers, Orc Shamans and Blood Shamans. Nifty.
Btw, the unit is called Orc Chieftain. He is big, but not an Ogre - that's another Level 5 unit (yep, the Orcs are the only race now with 2 Level 5 units).