I already had the troll kings head by the time I reached the archaeologists barracks. I knew someone named Lenton wanted it, because while browsing my inventory, it said, drop it on lentons doorstop for his promised reward. Problem was, I had never spoken to Lenton before then, now I go to the barracks and there he is, fighting the combat dummy, "object is busy and cannot talk to you now"

Am I stuck with the head? All of the other quests in that area are finished.

http://www.sorcerers.net/ubb/ultimatebb.php?/topic/6/1557.html

Yay! I'm a naughty poster.