Hmmm.
Technically, shrimp and prawn are two different but related species. Though that distinction tends only to be observed by zoologists and pedants.
Normally, I would call most of them prawns. In the UK, 'shrimp', is usually reserved for the smallest varieties. In fact, 'shrimp' is a common expression used to describe anything or anyone of less than average stature.
I suppose, living abroad for half my life in places where 'shrimp' is preferred, I have reluctantly taken to calling them all 'shrimp', irrespective of their true nature. Saves endless explanations. Although 'prawn' is more common worldwide.
I'm not sure what you mean my crustacians look uncleaned! They are most certainly cleaned.
I never split prawns/shrimp to devein them. It is easy to do so by other methods. I use the toothpick method. That said, many I buy have been starved for some time and have naturaly purged themselves.
Frozen critters are often sold here deveined, but also unsplit - not that I buy them often.
