Lindwurm

Coiling like a living corkscrew and moving with a scraping hiss, this serpentine creature skates nimbly across ice on long curving claws, maw agape and stinking of a hundred graves.
  Swift and Smooth as Ice. Lindwurms have long bodies and crocodilian jaws, but they skitter overland on spindly limbs. Their talons are long and curved, acting as skates or short skis when moving over ice. Few things are swifter on the ice.
  Sea Hunters. In the wild, lindwurms hunt in groups, looking for breaching whales, seals, or incautious fishermen. They enjoy surrounding and surprising foes. With their considerable cunning, they may skate by their prey at speed, snapping a bite as they pass or snatching up prey with their constricting tails.