icesus

Hiperborean or Giperborean or smth like this, not sure how to spell this word :p Hyperborean is cool-sounding but rather trite as the Barbarian (Conan, of course), was from the Hyperborean people. I vastly prefer it to 'Wilders', though, which never fails to remind me of The Little House on the Pra...

Snow/Ice/Frost Flayers

The Fierce - or possibly some variant, such as The Fierced, The Fiercen or The Fiercemen.

Edit: Reapers of the Ice; Reapers of the Frozen Wastelands