From the Super Mario Wiki
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They appear in nests carved in the ice and pop out when Donkey Kong approaches them. If Donkey Kong gets in contact with a Snow Mole, he loses either five or ten beats (a heart in the New Play Control! version). Snow Moles appear in various sizes, as some are slightly larger than Donkey Kong while others are significantly larger than him. Snow Moles are one of the few enemies who cannot be defeated, although Donkey Kong can use the Sound Wave Attack to make a Snow Mole descend back into its nest temporarily.
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