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It almost goes without saying that Play-Doh is delicious. Likewise the ends of young pine needles, glue sticks, Bonne Bell lip gloss (edible, but you weren't supposed to bite it, I don't think), and various kinds of paper including the pages of magazines and books. Usually just the corners, so no one would notice and be mad.
Occasionally chewed on a mouthful of rubber bands because it was sproingy.
I also liked to suck on coins and different kinds of pebbles. When I was three, I accidentally swallowed a beautiful red glass Pente piece, and for the next several weeks, I waited with the certainty that I would die. It was more than twenty years before I mentioned it to my parents. I think it's still in there.