To me, there's three preferred types of trolls.
The classic (Tolkien) trolls are born of stone and earth, large and durable, with limited intelligence. They often have strange weaknesses like being turned to stone in the light.
DnD trolls are green and have superior regeneration, capable of recovering from wounds in moments. Most of them are giantkin like the classic trolls, but some are human sized. Warcraft Trolls, for example.
Age of Wonders trolls are large and intelligent in a cunning way- selfish and cruel. They're covered in fur and can build surprisingly powerful nations when left alone. Since they go out of their way to attack people though, they don't get left alone if other people are nearby. Elder Scrolls trolls fall into this category.
Mixing and matching is fine, but to be a troll it needs to have something or another from these types.