Skookum

The sharks from the 2013 movie Avalanche Sharks.

Appearance
They look like a regular shark. Their scales are blue-gray.

Powers
They are supernatural spirits that take the form of sharks made of ice. They can materialize within snow, ice and water, and can swim and breath in it. They are ambush predators and have shown signs of intelligent behavior, for instance: leaving an injured victim alive in order to attract more people towards them.