Carnotaurus

Charge. If the carnotaurus moves at least 20 feet straight toward a target and then hits it with a headbutt attack on the same turn, the target takes an extra 5 (1d10) bludgeoning damage. If the target is a creature, it must succeed on a DC 14 Strength saving throw or be knocked prone.

Pack Tactics. The carnotaurus has advantage on an attack roll against a creature if at least one of the carnotaurus' allies is within 5 feet of the creature and the ally isn't incapacitated.

Bite. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 15 (2d10 + 4) piercing damage.

Headbutt. Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 20 (3d10 + 4) bludgeoning damage plus 5 (1d10) piercing damage.