The Sermilik, “ice-clad”, is an enormous and highly dangerous polar bear found in the seas around Aasiaat in Greenland. Unlike the bears it resembles, it has very long fur completely covered with ice. Four lumps of ice at the surface are in fact the four paws of a sermilik lying in wait, and young hunters are warned never to paddle near those.
References
Birket-Smith, K. (1924) Ethnography of the Egedesminde District. Bianco Lunos Bogtrykkeri, Copenhagen.
A Book of Creatures 
there is any more information about it?
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That’s all I was able to find, but the source says that tales of ice-clad bears are common in Greenland.
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This looks like Beartic would evolve into.
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Makes sense.
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Or a Mega/Gigantamax form.
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ice-chad
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