Multiattack. The ceratops makes one Gore attack and one Stomp attack.

Gore. Melee Weapon Attack: +11 to hit, reach 10 ft., one target. Hit: 29 (4d10 + 7) piercing damage. If the ceratops moved at least 20 feet in a straight line toward the target immediately before the hit, the target takes an extra 11 (2d10) piercing damage; if the target is a creature, it also must succeed on a DC 19 Strength saving throw or be pushed up to 20 feet from the ceratops and have the prone condition.

Stomp. Melee Weapon Attack: +11 to hit, reach 5 ft., one target. Hit: 29 (4d10 + 7) bludgeoning damage.