Mini Cheddars were the result of product diversification by McVitie’s as sales of their originals began to wane.
They became increasingly popular in the early 1970s, and soon new flavours were introduced. Flavours include (as of summer 2006): Marmite, BBQ Beef, Branston Pickle, Cheese & Onion, Ham & Cheese and Mature Cheddar.
A new range of crispier crinkled Mini Cheddars called Crinklys has been launched, with flavours such as Cheese & Onion, Salt & Vinegar, Prawn Cocktail and Sweet Chilli.
They have a granular crumbly texture unlike crackers which are harder, more brittle and flaky in texture. (source)
So can hamsters eat mini cheddars?
Unfortunately they are just too salty for them.