The Swampland Expansion Add-on 1.19+/1.18+

Swamps are the most boring and gloomy places in Minecraft, which have not become more popular due to either Frogs or Mangrove blocks. You'll have to do everything yourself: try the Swampland Expansion mod to add new mobs and blocks to swamp locations.

Mangrove Zombie
Hostile
Health: 25
Effect: Slowness


Ancient Swamp Zombie
Hostile
Health: 22
Effect: Hunger


Swamp Drowned
Hostile
Health: 22


Swamp Crab
Neutral
Health: 11


Swamp Fish
Neutral
Health: 10


Swamp Zombie
Hostile


Swamp Spider
Hostile
Health: 22
Effect: Poison


Red Frog
Neutral
Health: 10


Poisonous Frog
Hostile
Health: 11
Effect: Poison


Swamp Trader
Neutral
Health: 20


Swamp Grass
Hostile
Health: 25
Effect: Slowness