Eddies and suction pools

In one of my not so interesting classes today we got on the subject of ocean eddies. For those who don’t know, they’re formed when warm water get trapped in a body of cold water, and vice versa. Now, I was curious if suction pools, or, whirlpools are formed by this same process, such as the ones in the english channel, the sort than can suck large objects under water. If they’re not formed by this proccess, how are they formed ?

Oceanic whirlpools.