(I miss the bakeries in Taipei.)
These ones are freshly imported from Taipei to New York City, where John the Scientist bought them (thanks, John! :) ).
Aside from sachimas, I also grew up eating rice krispie treats that also didn't include rice krispies. My mother would make them with other breakfast cereals (captain crunch treats! corn pop treats!) and crispy noodles (like from La Choy; got served to the restaurant customers with the soups). Some of them were pretty good. Others, well, one could file them under "interesting." ;)
As for the title question: I have no idea. Wikipedia didn't say, and everyone else just copied from Wikipedia. T.T But I did find a blog of a western family living in Shanghai that I thought was pretty cool.