For the record, this is not a "Japanese" tradition, but something practiced in a couple of villages in Gifu prefecture. Most Japanese do not eat insects and find this just as weird as the average Westerner.
The one insect-based food in Japan that is moderately common is tsukudani (a type of soy-based pickle) made from crickets (enago), but even this is kinda niche and you're unlikely to run into it unless you look for it.
The one insect-based food in Japan that is moderately common is tsukudani (a type of soy-based pickle) made from crickets (enago), but even this is kinda niche and you're unlikely to run into it unless you look for it.