Anger in the Old Forest!

[Gwathagor]

I'm pretty sure that the Old Forest is made up of huorns rather than Entwives. First, Entwives seem too benevolent to me to be waylaying travelers. Second, Entwives don't live in forests, but gardens. Third, would Entwives really be mistaken for trees? They look even less like trees than their male counterparts, and all Onod-kind have humanoid bodies.

Old Man Willow seems to me like a black-hearted huorn, rather than an Entwife, as he is both stationary and masculine.

I'm inclined to agree with Rune and skip that the Old Forest trees are probably resentful of the intrusion of the Children of Illuvatar upon their ancient territory, whether it be hobbits or Bree-landers or whoever.