Hairyphants are a type of animal. They appear to resemble mammoths, or hairy elephants as the name suggests. Whether they are mutant elephants or mammoths that were frozen in the ice and successfully thawed out again is unknown as yet.
They first appeared after the Sixty Minute War to be roaming The Ice Wastes in the North. The Northern Nomads sometimes put armour on them and rode them into war. Whether they carried on roaming the Ice Wastes during the later traction era is unknown; perhaps they escaped the cities in mountainous areas like Greenland (the 'Great Northern Speed Bump' to ice cities).