This isn't the first thing that comes to mind when I read "Japanese toilet", what is the name of the toilet that is in the ground, that long oval shape with bump in front (or back?)
Update: "washiki" is the name
Update: "washiki" is the name
The term for bidet/Toto style toilets in Japan is washlet (ワッシュレット).
Otherwise, "Washiki toilet" is a term of art, and will not point to washlets. It will be the official designation in Japan as well.
I'm not convinced though maybe I was just never properly trained. When I use a squat toilet I have my pants bunched up, when I squat the bunched up pants are between my upper and lower legs and cut off the ciruculation in my legs. If I'm constipated it my legs are screaming much sooner than on a seat.