Wood-trolls, as their name suggests, have bark-like skin, root-like feet, and leafy growths protruding from their bodies. They resemble distorted cousins of the Ents. Wood-trolls often band together under an elder Wood-troll or a powerful Huorn.
It is said that Trolls were originally bred by the Dark Lord Morgoth in mockery of Ents. If this is so, the Wood-trolls must be the cruelest joke against the gentle Tree-herders, a blasphemy of the natural order and a dark mirror of what the Ents could become if they fall to darkness.
Wood-trolls are found in Southern Emyn Uial in Evendim, the North Trollshaws and Eryn Singor in The Trollshaws, the Mournshaws in Enedwaith, the Balewood in Wildermore, the Entwood in West Rohan, and throughout Eregion. They are Elite and are always aggressive. They are weak to Fire damage and to a lesser extent Light and Beleriand damage, and are resistant to Common damage.
A list of all known sightings:
Wood-trolls were created for The Lord of the Rings Online. J.R.R. Tolkien does not mention this breed of Troll in his stories of Middle-earth, though he does use the term in his translation of the Middle English poem Sir Gawain and the Green Knight.