In a lot of folklore, the male trolls are huge, brutish, and strong, and female trolls are big but more tricksy/witchy. Renaming troll shamans into "Tollwives" and troll magicians into "Troll Hags" or "Troll Witches" would add a small amount of flavor to the troll race at very little dev cost.
For slightly more cost, you could remove the fireball spell from Troll Witches and replace it with subset of Weakness/Warp Creature/Web to make them seem more witchy.
For slightly more cost, you could remove the fireball spell from Troll Witches and replace it with subset of Weakness/Warp Creature/Web to make them seem more witchy.