add jellyfish, penguins (only native to cold biomes) and sharks

we need more aquatic mobs honestly i think the jellyfish will float around and for killing it you get one of its tenticals with you can use for a tool to stun mobs next penguins you feed them fish and they belly slide and show you the way to the nearest shipwreck, igloo or village and finally the shark will be a passive mob sometimes it will attack you other times it wont its random for hitting it once in the nose (if it is fighting you) the shark will swim away (for killing it you get a shark tooth and you can craft a necklace and wear it in your chest piece slot