I've heard hit & switch, sit & switch, Minnesota switch, and just switch paddling. North American touring technique (NATT) was a fancy name and acronym that the late Harry Roberts tried to popularize, frequently in his written technique debates with Mike Galt in the 1980s, but which never caught on.
There is a difference between the amateurish switching of paddling sides that every newbie resorts to with all manner of paddles before learning single-side correction strokes vs. the highly practiced aerial switching with light bent shaft paddles of flat water racing technique that also filters down to a hit & switch cruising technique.
I have always been a kneeler 95% of the time in all waters with straight and bent paddles—including when I choose to hit & switch bent paddle for speed, to go up-current or to fight winds—so I don't think "sit & switch" describes what I do in a CanAm open canoe.
In my outrigger canoe I sit with legs extended on rudder pedals, always use a bent shaft paddle and paddle on both sides, but I wouldn't call that technique any of the names I've so far discussed. Because I have a rudder I don't "have" to switch, and may go hundreds or even thousands of strokes on one side before switching to the other just to equalize arm tiredness and to promote my quest for paddle-side ambidexterity.