Shrek – Has 100 health and is a slow, neutral mob.
Fiona – Also has 100 health and is a slightly quicker neutral mob.
Donkey – Has 10 health and is like a pig.
Gingy – Has 10 health and tries to run away when you punch him. Poor thing.
Pinocchio – Has 10 health and also runs away when hit.
Lord Farquaad – Is a hostile mob with 30 health.
All of these mobs spawn in the swamp biome, except for Gingy, who can spawn anywhere.