More Zombie Types Mod

A mod I made from a suggestion made by AlpekYT on https://www.minecraftforum.net/

Description:

This mod adds two new Zombies, One called "The Frozen" and the other called "The Burned"

The Frozen: 

Its Zombie that only spawns in snow biomes

When in water for too long they first turn into normal zombies then to drowned

They will detect player from same range as zombies

When they attack player the player gets slowness effect for 30 seconds

They will drop snowballs, fresh meat, and leather armor which they sometimes wear 

Fire aspect deals extra damage

The Burned:

It's a Zombie that spawns in the nether, and has a lava like look.

They are immune to fire and lava

They turn into normal zombies and then to drowned if in water. They also become extingushed while in water which makes it so they can't set the player on fire.

I couldn't get them to spawn in the world despite adding them to the spawn list for nether and cold biomes... Source is availble if you know what I did wrong...

Original post: https://www.minecraftforum.net/forums/mapping-and-modding-java-edition/minecraft-mods/requests-ideas-for-mods/3112966-new-zombies-type