Hi
I now show you Mobs Mod.
You can use Crocodile Tooth and craft Tooth Tools and Armor.
Crocodile kills cows and whaen u hold raw beff crocodile follow you.
Spawn: minecraft:River minecraft:Savanna

Dragon kill players and you can get Dragon Scale from it
When you get Dragon Scale You get Achigment [​How to train your dragon?]
Spawn: minecraft:badlands

Frog can be tamed by lily pad and you can breed your frog ONLY TAMED by lily pad.
Spawning: ALL swamps