Brand owner UBUK is also using limited editions to add variety to Hula Hoops and Mini Cheddars.
Grocery trading director Paul Graham said: "Flavour variety creates interest at point of purchase and brings new users to the brands."
The McCoy's Pub Grub range includes sausage, onion & gravy, ploughman's cheese & pickle and steak & ale pie variants and come in a variety six-pack (rsp:£1.29).
The Hula Hoops new Pirates range in Smugglers Smokey Bacon and Caribbean Prawn Cocktail flavours is backed by an on-pack promotion to win £5,000 in gold and includes a mixed 99p seven-pack.
Mini Cheddars' new lines are a cheese & onion seven-pack at £1.19, a similar-sized variety pack containing extra mature Cheddar, cheese & onion and original flavours, and a cheese & onion handy pack.