What’s the difference between Pork Scratchings, Pork Crackling and Pork Puffs?

Both Pork Scratchings and Pork Crackling are made using leg rind. They have slightly different fat/skin ratios and different cooking methods that result in Pork Scratchings being much more brittle, compared to the slightly lighter and crisper Pork Crackling. Pork Puffs however are made using back rind, which is completely free of fat and results in a very puffed texture, and a lower fat content.