Dunno - I know they don't have chocolate gum (at least *real* chocolate gum - not gum with chocolate flavoring) because of the cocoa butter not mixing well with the emulsifier. It's sort of the Holy Grail of gum makers to figure that out. At least that's the "official" story.
Possibly something similar is going on with peanut butter gum. I think gum and peanut butter are like matter and anti-matter. Or at least oil and water. They don't mix. So, better question: if they did make peanut butter gum, what would you use to get it out of your hair?
