Deadcrab. Or maybe Frozencrab.
Crabs are found only in tropical climates....so....Skyrim isn't exactly the Jamaica of Tamriel, if you know what I mean. I don't think they could survive in the cold.
Maybe there will be a different pest critter? Like a beaver, or something? Y'know, furry and soft, and kinda' cute until it unleashes it's deadly fangs upon you.
Umm.. have you ever heard of http://en.wikipedia.org/wiki/King_crab or Alaskan King Crab Fishing, hell you haven't atleast heard of the Discovery Channel show
Deadliest Catch? I don't think the Bering Sea, with some of the coldest
[average winter lows ?20 °C (?4 °F) with possible lows approaching ?50 °C (?58 °F)]and stormiest waters on earth is very tropical in climate.
Those are the design I hope the Skyrim Mudcrabs look like. More spikey like that...