We go to a kids party every Halloween before trick or treating and the hosts serve pizza with a few fun Halloween apps like pigs in a blanket that look like mummies and things like that. There are a ton of clever Halloween appetizers on Pinterest that kids love.
Maybe a cold lo mein "brains" salad. Corn dogs or you can take the hotdogs, wrap them with crescent dough to make mummy dogs, Fruit skewers, various chips and dips (maybe come up with cute names...thinking Hotel Transylvania with the scream cheese cake). Sliders are always good.
I have made these and they are beyond delicious, but then, I loved buffalo chicken.