Multiattack. The ghoul makes two Icy Bite attacks.
Icy Bite. Melee Attack Roll: +4, reach 5 ft. Hit: 9 (2d6 + 2) Cold damage, and the target's Speed decreases by 5 feet until the start of the ghoul's next turn.
Claw. Melee Attack Roll: +4, reach 5 ft. Hit: 4 (1d4 + 2) Slashing damage. If the target is a creature that isn't an Undead or elf, it is subjected to the following effect. Constitution Saving Throw: DC 10. Failure: The target has the Paralyzed condition until the end of its next turn.
Watery Rush. While underwater, the ghoul moves up to half its Swim Speed without provoking Opportunity Attacks.