Takoyaki (たこ焼き, lit. „grilled octopus“) are a popular kind of street food which you come across around nearly every corner in large Japanese cities, especially in the Kansai region (Ōsaka, Kyōto, …).
These came from the Tenjinbashi-suji in Ōsaka.
Edit: correct translation
Love them! And if anyone tells you “Japanese food is so healthy”, show them takoyaki!