There's also boiled crawfish
They look a bit like something between a large type of langouste or a spiny lobster. The former and similar varieties are very tasty. There are a lot off the western coasts of Britain.
These are I think freshwater though. Rather than seawater. Despite not liking river fish. I'd try them.
About crustaceans in Poland, since they simply weren't in the shops a few years ago, when they appeared, they were a rather nouveau riche thing with people wanting to show off by serving the biggest ones, often with shell still on. I still see echoes of this.
In fact, apart from lobster (and even then....) crustaceans tend to be better smaller rather than larger. If you haven't tried Dublin Bay Prawns, I recommend them.