Greatclub

Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 13 (2d8 + 4) bludgeoning damage and if the target is a Medium or smaller creature it makes a DC 14 Strength saving throw falling prone on a failure.

Sweeping Strike

Melee Weapon Attack: +6 to hit, reach 5 ft. all creatures within 5 feet. Hit: 8 (1d8 + 4) bludgeoning damage and if the target is a Medium or smaller creature it makes a DC 14 Strength saving throw. On a failure it is pushed 10 feet away from the ogre.

Grab

Melee Weapon Attack: +6 to hit, reach 5 ft., one target. Hit: 11 (2d6 + 4) bludgeoning damage and the target is grappled if its Medium or smaller (escape DC 14) and until the grapple ends the zombie can't grab another target.

Bite

Melee Weapon Attack: +6 to hit, reach 5 ft., one target grappled by a zombie. Hit: 15 (2d10 + 4) piercing damage and the zombie regains hit points equal to the damage dealt