Who's This? No, it's not Anthro! This caveboy is on page 32 of Who's Who vol.XII.
How you could have heard of him: Who's Who and healthy curiosity, maybe? I don't think Kong appeared anywhere else, except maybe for a cameo in History of the DCU at around the same time.
Example story: Kong the Untamed #2
Who else? What, no Knights of the Galaxy? Wanna make something of it?! I also could have presented one or both of the Killer Sharks. Well, I'll get them on a second go-around, but right now I'm eager to see who's in Who's Who volume 13!