I don't snack a lot at the parks, but, have been known to share a turkey leg or two for lunch. I like smoked meats so this is good for me, but, we don't walk and eat with a drummie full of meat caveman style.
Most of what people have said here are things I'd never even be tempted to buy in the parks. No hot dogs, burgers, pretzels for me. Too much margin for error. I have definitely had rice krispie treats somewhere along the line and thought they were delicious. No surprise because I think Disney marshmallows for camp fire s'mores are the very best anywhere.