Keen Smell

The Yule Lad has advantage on Wisdom (Perception) checks that rely on smell.

Snow Worthy

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

Multiattack

The Yule Lad can use its Chilling Gaze or Yule Breath and makes two claw attacks.

Claw: Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 7 (1d6 + 4) [slashing] damage plus 3 (1d6) cold damage. 

Chilling Gaze: The Yule Lad targets one creature it can see within 30 feet of it. If the target can see the Yule Lad, the target must succeed on a DC 13 Constitution saving throw against this magic or take 10 (3d6) cold damage and then be paralyzed for 1 minute, unless it is immune to cold damage. The target can repeat the saving throw at the end of its turns, ending the effect on itself on a success. If the target's saving throw is successful, or if the effect ends on it, the target is immune to the Chilling Gaze of all Yule Lads for 1 hour.

Yule Breath: The Yule Lad exhales an icy blast of hail in a 15-foot cone. Each creature in taht area must make a DC 12 Constitution saving throw, taking 22 (5d8) cold damage on a failed save, or half as much damage on a successful one.