I actually couldn't find Troll stats in the "5816 Races & Cultures" book - sorry
That's a bit disappointing.
Still, converting from RM2 should be pretty straightforward. The trickiest part is going to be picking Body Dev and PP Dev progressions, but it shouldn't take much effort for a moderately capable GM to eyeball suitable figures. I pulled out C&T I to assist with a War Troll Fighter NPC recently, and it only took a quick glance at the RM2 stats to pluck some suitable RMSS numbers.
Edit: Ah, except for adolescent development. Still, even there, just grab Orc (Greater) and tweak a little and you're pretty much done.