alaskan pollack, pronounced pah-luck, is often used to make imitation crab legs. if you've had a california roll, you've probably had pollack.
pollock, pronounced poh-lock, is a slang term for a person of polish nationality or ancestry. it's an insult or a term of endearment, depending on how it's used, and how well you know the person you are referring it to, kind of like calling an irishman a paddy.
A true lover of nature does not despair now that his mistress has turned a colder cheek.