I've recently written more than one puzzle in the form of a poem, neither of which I would really classify as "riddles". There are plenty of others that I've seen (a few more recently than others) that follow along this same pattern. I'm hesitant to add a tag though, because I've seen new tags with 1 or 2 associated questions be purged pretty quickly. My questions here are twofold:
Is it okay to add a new tag like this without discussion (moot now, but I'm still curious), or is it frowned upon?
Is there enough of a distinction between puzzles set in the form of a poem and puzzles set in the form of a riddle to merit adding a new tag here?