At times I feed my chickens most of the snacks you have on your poll. About the only exceptions are pineapple (because of the high acid content) and cooked meats (which would probably be fine as long as they are well cooked, but I've never taken any chances of inducing cannibalism by feeding them meat). My chickens especially love the pumpkin innards from Jack-O-Lanterns and watermelon, and they have great fun with a cabbage head hung by a rope but low enough that they can reach it.
Grapes and cheese are two items that you can lose a finger with my girls if you are not careful about how you hold them. After 2-3 grapes going out, they will start to just jump at your fingers so they get it first even if there's no grape there.
Mine love yogurt with whatever kitchen slop I have to get rid of. I enjoy mixing up slop....like yogurt with leftover shepherds pie, bread crusts and carrot peels....yucky but the chickens love it. Oh, and drizzle some molasses over it and they act like its a hot fudge Sundae.