Snap, Krackle, Pop!

This morning Caleb was eating Cocoa Krispies for breakfast and he got into a conversation with Ostin about the names of the guys on the box. Caleb was asking why they were named Snap, Krackle, and Pop. Ostin's answer? Snap is named Snap because he snaps a lot, Krackle because he krackles and Pop? Well, Pop is named Pop because he is a pop, you know, like a dad. That last one kind of broke the pattern I was expecting.