The Huorns were a kind of Ent who didn't develop distinct personalities, and ended up more like simple trees. Although they didn't speak, they understood what the Ents said. During the War of the Ring, the Ents managed to wake up the Huorns and make them participate in the battle.

The Huorns were involved in the defeat of Saruman in Isengard.
Encyclopedia entry originally written by Annúnagar