Why did Noah put the crocodiles on his boat?

Putting amphibians on the Arc was not necessary. They could survive on their own, and did.

Just as fish could survive without being on the Arc.

So his wife could have a Handbag.

Did he?

As I understand it, all the land creatures were put onto the ark, but those that could swim didn't need to get on the ark. That's why we still have huge creatures in the sea (even what some would consider dinosaurs) - they didn't need to be saved from a flood. And we know Crocodiles and Gators can swim, even in the ocean, for they come out to the ocean in Florida.

Ask him when you see him. I'm gonna ask why he put fleas, flies, snakes, scorpions and sharks (sharks??)

To eat the invasive species of fish, and protect the underwater environment. Crocodiles and "Gators" weren't dangerous to mankind until after the flood. Genesis 9:2

His wife made him.

She thought it might be nice to have a fancy purse some day.

Gen 6:20 Of the birds after their kind, of the livestock after their kind, of every creeping thing of the ground after its kind, two of every sort shall come to you, to keep them alive.

They came to Noah, not the other way around. Noah wanted to obey God so let all the animals on board.

They weren't crocodiles, but Reptile Kind. I'm assuming they weren't clean animals, so it was probably a single breeding pair. After the voyage, they adaptationated into everything from snakes to crocs to turtles over less than a thousand years, in a process that was NOT evilution. Because reasons.

Yeah, and black widow spiders? Yuck!

He didn't... God did.