The frost mole has advantage on Wisdom (Perception) checks that rely on smell.

The frost mole can burrow through nonmagical snow and ice in addition to sand, earth, and mud.

The frost mole has advantage on Dexterity (Stealth) checks made to hide in snowy terrain.

If the frost mole moves at least 20 feet straight toward a creature, it can dig a 5-foot-diameter, 20-foot-deep pit beneath the creature. If the target is Medium or smaller, it must succeed on a DC 13 Dexterity saving throw or fall into the pit and land prone, taking falling damage as normal. If the target is Large or larger, it must succeed on a DC 13 Dexterity saving throw or be restrained. If the target is prone or restrained, the mole can make one claw attack against it as a bonus action.