He knows of their existence (http://hetalia.livejournal.com/11327579.html). And from the looks of that photo in the blog post, he's tried some, too, but I don't understand Japanese as well as I'd like to.
It is said that living things are made from the original small blue potatoes and blue potatoes for this. Toka seems perfect for gifts so refreshing and quite delicious potato chips! I'm rich and I components are included in the blueberries, according to the reader's information.
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BLUE POTATOES
what.
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Google-Fu, you are too much for me sometimes... :'D