I enjoy mixed wheat crackers here in NYC from the Hadson Toko Trading Co. similar to http://taquitos.snacktacular.com/snac.... Where I buy them they are called Aji Yose.
It's several types of crackers, some sweet, some a bit spicy. However, i don't really know if they exist in Japan and/or what they are truly called. I'm hoping to find some when I go next week, but don't have a clue where to look.
Are these authentic and what are they called?
You can find that kind of stuff all over the place- i.e. supermarkets, convenience stores, etc. There's all types, including the one pictured and there's usually a whole section dedicated to sembei. You can try "depa-chika" food markets under the department stores at major train stations as well.