It's a bit controversial that oats are considered chametz. While Rashi (Pesachim 35b, et. al.) translates Shiboles Shu'al as oats, not all Rishonim agree to this definition. For instance, the Rambam (commentary to Kilayim 1:1) holds that Shiboles Shu'al is desert barley.
- Are there any communities today which reject Rashi's translation in favor of the Rambam's (or some other Rishon I don't know about who doesn't like either of their translations), and thereby hold that bread containing oats is permissible on Pesach?
- If such a community does exist, and they hold that Kitniyos are forbidden on Pesach, do they consider oats to be Kitniyos and forbid them for that reason instead?