Takoyaki - octopus dumplings

Okonomiyaki - savoury pancake

Yakitori - charcoal grilled meat skewers

You can try daifuku mochi (https://en.wikipedia.org/wiki/Daifuku). I think they're traditionally served around New Year but you should be able to find some. Be careful to take small bites as it is easy to choke on it.

だんご　

団子　

Dango - a japanese dessert usually coated with a soy sauce sugar glaze. It comes in skewers. 

           Sometimes it can be a savoury dish, just coated with soy sauce. 

https://www.google.co.jp/search?q=dango&client=safari&rls=en&source=lnms&tbm=isch&sa=X&ved=0CAcQ_AUoAWoVChMIhu6llODgxgIVSJSUCh0I3Qux&biw=1357&bih=784

when ur in osaka, if u dare, go try some fugu...