Winter wolf

A winter wolf is more akin to worgs than actual wolves, being of wicked intelligence and cunning. It grows to about eight feet (2.4m) in length, four and a half feet (1.4m) at the shoulder, and weighs around 450 pounds (204kg). They usually have blue eyes. Winter wolves live in packs of around three to five, sometimes found as allies and guardians of frost giants, white dragons, and other evil arctic beings. They speak Giant and Common.

Combat and tactics
Winter wolves will encircle their prey and take turns to attack, or attempt to pin it. They have cold-based breath weapons and a bite attack. They can also trip their enemies. They are immune to any cold attacks, but are vulnerable against fire.

Other
There is a millitary organization called The Chill, based in the Lurkwood. There they have a divison called the Winter Wolves.