To answer the title question: Yes. There are Quad die coins, too. To answer the follow-up in the body: No.
I would hope so. At least thats what Bill Fivaz, JT Stanton and James Wiles all say. Maybe they're wrong.
Here is an example of a sextuple die, 50c 67 DDO-006. To answer your question...yes there is such a thing as a triple die, yours is not one. Larry Nienaber
Who said anything about it being a half dollar??? JUST Kidding. I couldn't resist. It is a 1934D Oregon trail commemorative.