I have seen parting/bedan/'sizing tools used to form tenons. and while they do a fair job of forming the sides of a tenon. I would still clean it up with a gouge, mostly for less tear out. They can be used to part off bowl blanks, but for me, I don't leave enough of a recess to make a parting tool worth the effort. It would be the same thing with removing a tenon. If you have a long tenon, you are kind of wasting wood, and I am frugal...
robo hippy