As I walked quickly through the store yesterday, I looked for some more names of products that probably wouldn't make it too well in the US (there are plenty in Japan).
In the comments of Calpis, scfr suggested I introduce those that don't know to Pocari Sweat:
I came across some chocolates with the name Asse:
and sometimes I wonder if the Japanese just accidentally use the wrong word. This is for a snack called Leafy, but it seems to me what they wanted to call it was Flaky:
I'm sure I'll come across more to share...