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Here’s the creatures getting the shark type
Battering Krasis: Fish Beast -> Shark Beast
Giant Shark: Fish -> Shark
Half-Shark, Half-: Fish -> Shark
Hammerhead Shark: Fish-> Shark
Shambleshark: Fish Crab -> Shark Crab
Sharktocrab: Fish Octopus Crab -> Shark Octopus Crab
https://magic.wizards.com/en/articles/archive/feature/ikoria-lair-behemoths-and-commander-2020-edition-release-notes-2020-04-10
And here’s all the rules for the new cards