Ignoring the matter of whether it's organic or not, if you want a less-processed oat, just use whole oats. That would be even closer to natural than oat groats, and presumably lose even less nutrients.
Yes, apparently rolled oats do have a bit more processing-- I've read that they are steamed...
I'm pretty sure that will have too little protein, and the protein it does have will be too low in certain amino acids.
I don't know enough about vitamin requirements to tell if you'll be short there too.
@U_Stormcrow knows a lot more than I do about what chickens need in their feed, and...