Undead Fortitude. If damage reduces the zombie to 0 hit points, it must make a Constitution saving throw with a DC of 5 + the damage taken, unless the damage is radiant or from a critical hit. On a success, the zombie drops to 1 hit point instead.

Prodigy Dead. Will hide in a corner and make a sound like a crying child, if an investigation check is used on it the players must make a insight check versus a deception check by this creature. If failed this creature makes a pounce attack on the closest player with advantage.

Slam. Melee Weapon Attack: +3 to hit, reach 5 ft., one target. Hit: 4 (1d6 + 1) bludgeoning damage.

Pounce. Melee Weapon Attack: +5 to hit, reach 10 ft., one target. Hit: 4 (1d6 + 1) bludgeoning damage  and is grappled.

Bite. Melee Weapon Attack: +7 to hit, reach touch, one target. Hit: 13 (3d6 + 4)  on a hit the target must make a DC 14 con save,on a failed save the target becomes a zombie with their current equipment when they die.