It doesn't make sense to post it there, since it's completely empty when viewed from Lemmy. Lemmy doesn't support polls yet, thus doesn't display poll posts.
Not a community, but new people on Mastodon use the hashtag #newhere to introduce themselves or ask newbie questions. I don't know if that could be integrated into a Piefed/Lemmy community or if it would create too much noise.
Thank you very much!