Torah: Hooves, horns, and bones aren’t food and as thus aren’t Treif if you want to attempt to shred your esophagus, stomach, and/or intestines open by eating them. Skin isn’t Treif either (a pig’s might be, actually, I’m not sure) unless you fry/prepare it in some way to make it edible, in which case it becomes Treif retroactively. (At least, I seem to recall a random Rashi implying that if you prepare it it becomes Treif but I don’t quite remember where.)
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