One thing I would definitely be careful of is the fact that in many cases ogres are the generic form of Orcs, and halflings substituted for Hobbits, both of which I'd personally avoid simply because they ARE Tolkien's creations and quite possibly under copyright, and the Tolkien estate is not afraid to let you know when you've overstepped your bounds.
As for the "Spags", mentioned by TheEndIsNigh, not that I disagree with that certainly being a better option than Orcs, just in my opinion, but you don't want it to become a situation where you're taking a pre-established thing and giving it a new name to say "Bam! Now it's different!" If all you really want to have is an ogre type thing, then make it an ogre type thing. If what you want comes similar to an ogre type thing, but has a completely different societal structure with surprisingly complex ins and outs, a system of written language, organised festivals, and a drooling problem, then give them a name that separates them from the crowd.
Here:
- "Call a Rabbit a Smeerp"
A cheap technique for false exoticism, in which common elements of the real world are re-named for a fantastic milieu without any real alteration in their basic nature or behavior. "Smeerps" are especially common in fantasy worlds, where people often ride exotic steeds that look and act just like horses. (Attributed to James Blish.)
From the Turkey City Lexicon.
I've personally found this to be a very important reminder in my own world building and think it's something everyone could use at some time or another.
That's just me and my opinion, though.