Multiattack. The goose makes one Beak attack and two Wing attacks.
Beak. Melee Weapon Attack: +4 to hit, reach 10 ft., one target. Hit:9 (2d6 + 2) bludgeoning damage.
Wing. Melee Weapon Attack: +4 to hit, reach 5 ft., one target. Hit:7 (1d10 + 2) bludgeoning damage, and the target must succeed on a DC 12 Strength saving throw or have the prone condition.
Thunderous Honk (Recharge 5–6). The goose honks with ear-splitting volume. Each other creature within 30 feet of the goose must make a DC 12 Constitution saving throw. On a failed save, a creature takes 16 (3d10) thunder damage and has the deafened condition until the start of the goose's next turn. On a successful save, a creature takes half as much damage only. The honk can be heard within 300 feet.
Giants keep geese as livestock for eggs and because geese make excellent sentries, protecting the giants' property with their keen senses and loud voices. Not only are giant geese from fey stock significantly larger than ordinary geese, but they also have two magical properties that make them even more valuable: their honk is a powerful defense against intruders, and they can lay eggs with shells of pure gold.