Jackalope (5e Creature)
From D&D Wiki
Small beast, unaligned
Charge. If the jackalope moves at least 20 feet straight toward a target and then hits it with a ram attack on the same turn, the target takes an extra 2 (1d4) bludgeoning damage. If the target is a creature, it must succeed on a DC 10 Strength saving throw or be knocked prone.
Ram. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit: 4 (1d4 + 2) bludgeoning damage.
Jackalopes are a breed of hare with a set of horns. The males might have long, curved horns like an antelope, or antlers like a deer.