if a nicheling is trapped under for one night then wont the ice freeze over the nicheling, which will actually give the hammer tail a use for breaking nicheling out of ice as u said.
k i'll probs post it in comments here in about 1 to 2 days (it'll be a pic of a normal nicheling with all the normal genes execpt for the ones suggested here made from spore)
also i think one of the genes i've mentioned in my own suggestions might appeal to this as said gene is based off of feline traits (suggestion name: a fiery, savanna-dwelling, cothreat)
4 words: BIRD OF PREY BEAK! i like the concept of the idea but the ideas nead more work, variety, and amount. maybe also like a long fluffy cat tail that gives cold resistance