Fried food that I think is most famous croquettes. Most Japanese are familiar from childhood.
This has evolved into style unique to Japan different from those of the original.
It is an object that has the oval that commonly found in convenience stores and, like stand-up meal noodle shop, it looks also like a deformation of hashed potatoes, but the potatoes went inside to taste smoother.
The price is around 120 yen from ¥ 60 one cheap. The cheapest one I saw was 20 yen one.
You may want to say a little slowly in the Japanese pronunciation of it will be "KOROKKEH". Please, to try by all means.