You can probably remove the "+4 save vs. poison" from the SQ line, since you address it in the Saves line (this seems to be the standard, as seen in the hound archon, for example).
Add darkvision 60 ft. to SQ line.
You can remove the question mark from "Any cold land and underground?"
We still need numbers for hoar foxes and winter wolves in Org line.
CR 2 seems appropriate.
A bugbear has a LA of +1, and it seems on par with an amitok.
Here's a rewrite of the Amitoka as character section, based on our changes:
Amitoka as Characters
Most amitok leaders are adepts, and all amitok spellcasters are generally adepts. Amitok clerics worship Cryonax and can choose any two of the following domains: Air, Animal, Evil, and Water.
Amitok characters possess the following racial traits:
+6 Strength, +4 Constitution, -4 Intelligence, -2 Charisma
Medium size.
An amitok's base land speed is 30 feet.
Darkvision out to 60 feet.
Racial Hit Dice: An amitok begins with two levels of humanoid, which provide 2d8 Hit Dice, a base attack bonus of +1 and base saving throw bonuses of Fort +3, Ref +0, and Will +0.
Racial Skills: An amitok's humanoid levels give it skill points equal to 5 × (2 + Int modifier). Its class skills are Handle Animal, Listen, Spot, and Survival.
Racial Feats: An amitok's humanoid levels give it one feat.
+3 natural armor bonus.
+8 racial bonus on Hide checks in snowy environments.
+4 racial bonus on saves against poison.
Resistance to cold 5.
Automatic Languages: Common, Goblin, Giant. Bonus Languages: Draconic, Gnoll, Orc.
Favored Class: Barbarian.
Level Adjustment +1.