One quick point to bear in mind. At the Gladden Fields, 2000 orcs (motivated by the proximity of the ring) had great difficulty in defeating 200 weary Dunedain. I would guess that any type of troll would, one on one, be more than a match for a mortal warrior. I think that a force of orcs would have to greatly outnumber a force of trolls before having a reasonable chance of victory.
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