In references to the above (I figured this was better here than the thread that never ends) Lustrian Ogres Not my work, posted by Ben and Jen Carter (link) Slann-mage Ogre: Ogre Bulls: Thundertusk: Battle Standard Bearer: Angry Birds Scraplauncher (i think?): Giant Cannons: An even bigger conversion (if anyone knows where to get this model let me know, it would make a great Lizardmen conversion too!): There are more pictures on their flickr page of course. I also found this ogre, not by the same group, but an equally good conversion for the Lustria setting:
The idea of basically making King Kong out of a Thundertusk is brilliant. It really looks like a jungle creature that way.
I don't remember anything specific in the lore. Ogre culture was very migratory, so its conceivable a lost tribe wound up in Lustria somehow