This recipe for southern-fried chicken mentions something called "bagel chips."   What exactly are bagel chips, and how do you make them? All I can find are recipes for it or places that sell something in a bag that resembles potato chips. 
The operative word in prawn cocktail crisps is cocktail. They're  essentially Marie Rose sauce flavour, there's barely any prawn notes. Marie Rose sauce is usually tomato ketchup, mayo, a little Worcestershire Sauce, and cayenne. Should be easy to replicate at home.  