I think that ditty is not original to PJ. But yes, he's one of my favorites going back to National Lampoon days. His books
Parliament of Whores, and
Don't Vote, It Just Encourages the Bastards both come to mind among many others. I use him as an example of an archetypal caustic Ohio sense of humor. The National Lampoon edition about "Dacron, Ohio" was priceless.
I believe the poem about the French and their oral proclivities goes way back and is British in origin. I've been using it for years myself.