Interesting dream ... it's fascinating for me when memory is so clear after waking up. As I said I'd go with Wendy's term and consider them small apes. The "rodent-like" look would be due to convergent evolution - they developed a shape which was most appropriate for their underground living. Whether they developed from big ape-like creatures or from small monkeys ... we'd need a biologist to explain what's more probable, I guess. The "misshapen Trolls" are introduced in the story "The Searcher and the Sword" and still "knock the door" in The Final Quest (not actually showing there so far). My first thought when they appeared in SatS was ... O.O "Now EQ has Zombies!"