No, one would have to be driving all three cars regardless of who owns the cars. Since you can't drive three cars in NHRA competition, a triple is not possible, IMO.
When they talk about the 28 doubles that have happened in NHRA, the same driver was driving both cars.
http://nhra.com/story/2013/8/4/fletc...-ties-glidden/
So to have a triple, you would need to be driving all three cars. I suppose you could have an owner double or triple, but I don't think they keep track of those.