Man I don't even know if the takoyaki I ate one time was real or not. It didn't seem as if the thing was properly cooked...the dough resembled curdling cheese somewhat and it was drowned in mayo. But it was my first time too so I took it for granted that it was. y'know, the real thing. Hmm.
^ Sounds like a plan. Try one and stash the rest in the fridge.
Oh, it also probably depends on if they were drowned in mayo and stuff during the time when you left them out. If they had mayo on them, I'd say chuck it because mayo spoils really easily. If they had some other sauce but no mayo they should be good. Also, if the takoyaki were "naked", so to speak, they should be good.