Cryo-Zombie

Undead Fortitude. If damage reduces the cryo-zombie to 0 hit points, it must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is radiant, fire or from a critical hit. On a success, the cryo-zombie drops to 1 hit point instead.

Chilling presence If struck with a melee attack of neither fire or radiance, The attacker must make a dc 10, On failed save the attacker takes 1 point of cold damage and movement speed is halved until their next turn, On success no damage is taken and speed remains the same though they do feel very cold

Chilling presence (alt)  5ft cold aura that does 1d6 cold damage and halved speed on a failed save. dc10 on success take half damage and no movement penalty

Slam. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 4 (1d6 + 1) bludgeoning damage.

Frostbite: melee attack +3 to hit, point blank bite attack can only be done if target is grappled. Hit:4(1d6+1peircing) make a con dc save of 12, on a failed save take 1d4 cold damage

Grapple:  Creature attempt to reach out and grapple the target, reach 5ft. the target must make a grapple check against the creature to escape, the target may try again to break the grapple on their next turn.