Originally posted by Meow:

Originally posted by Forsaken1:

My understanding is that the trolls on the surface respawn, but the trolls in the troll caves do not respawn once killed.

actually, trolls do respawn in the caves, it just takes a few in game days

This is incorrect. Trolls inside the caves may indeed respawn (although I have NOT seen it happen), but it CERTAINLY takes more than "a few days" if it's possible at all.

I am playing vanilla, and regularly visit one Troll Cave on my wait to a small Plains base I have.