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.

Taxidermy. If commanded to take this Action, the Zombie Giant Badger can lock itself into rigor mortis to stay perfectly still, becoming immobile. Its movement becomes 0 and it cannot take any Attack/Ability Actions or Reactions. Until it's commanded to use it's Action to drop rigor mortis, it will appear to simply be a taxidermied animal.

Creatures can use Perception or Investigation to determine the Badger is undead: DC 13.

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