The same names have been used for different beings in different eras and locales, and it can confuse matters when discussing such things.

I'll list some examples below and expand the list as things crop up.

Trolls:
In Vikingland, that's what they call Orcs. Troll Blooded are half orcs (although 'troll blooded' may be much more human and just showing more orc blood than usual, or just really large and well muscled humans)

In Daneland they are...Forest gnomes. Yep, right next door and that different.

In Central Europe they are usually Ogres or Hill giants...or actual Trolls.

Witches:
Generally Wise women (medicine and/or herbalism trained) with warlock training. Fiendish or Fey doesn't seem to matter, but rarely Far Realm and never Blade Pact.

Occasionally a older female druid may be confused as a witch.

Note that Witches are not bad, necessary, but so many are, that it's best to stick with the one you know.

Ogress:
A Russian witch that generally has an Evil Fey patron (hags, in other words). These witches ARE necessarily bad. Nasty, too.

Hags:
Ogresses or Hags. The difference is usually moot.

Elves:
In the British Isles, France, and Vikingland, they are the traditional D&D elves and Eladrin (both types).

In Daneland, Germany, and the North Pole, they are Rock Gnomes, and tend towards Cobbling, much like Leprechauns (Irish Forest Gnomes). Note that the North Pole Elves are actually transplanted German Elves.
This message was last edited by the GM at 20:22, Sat 16 Jan 2021.