VariantAPI

VariantAPI is a mod that adds data-driven entity variants.

You can specify conditions for variants to spawn based on predicates, moon phase, spawn biome, etc. And you can specify features for them to render with. All info is on the wiki. You can specify the variants with a datapack and the assets with a resourcepack.

This mod by itself doesn't do anything but you can download the base pack here that includes all of the variants from Minecraft Earth + More!

Mod required on client and server.