Is it possible to write have a triple major AND write THREE senior honors theses in college in FOUR years?

I think it would be impossible in any combination of majors for the vast majority of students. Something would have to give -- either not having three majors or not finishing in four years. You have to consider that you have to meet requirements beyond those of your major, since most schools also require various general education courses. And senior honors theses are typically closer to graduate-level work in the field than undergraduate-level work. It could be possible if you take course overloads every semester and/or take courses during the longer break periods (summer and winter). But I don't think this is reasonable for most people or something most students can handle.