All pellets are processed ? Anything altered from its natural state is considered processed to some degree.
As for freezing I haven't done too much research into it but freezing preserves nutrients better than most other storage methods or so I've read, if you have any resources saying differently I would very much like to read them.
As for the matter of food decay, freezing inhibits bacterial growth so if your bringing it out on a day by day basis, or chilling it when you bring portions out and not storing for silly lengths of time then it will be fine. Totally organic pellets states on the bag that it is suitable for freezing.
If any of this is really concerning anyone you can look into long term food storage methods using, suitable containers/bags, oxygen and moisture absorbers but tbh thats a hell of alot of hassle when most people will get through it pretty quickly anyway. It also needs you to 100% know what your doing because this method can be risky if you make any mistakes.
Andromeda wrote:How do you defrost it? I mean I know it doesn't block up but I imagine it's probably really hard and cold coming out of the freezer versus at room temperature. Do you put it in the fridge over night or leave it on the counter for a while?
One of my birds is super picky about cold things and refuses to eat anything below room temperature. When I give him juice or fruit that's been in the fridge I have to warm it up first.

I spilt the big bags up in 1/2lb portions to freeze and keep the currently in use portion in the fridge. Personally I will serve it cold or even frozen if I have forgotton to get a bag out the freezer and my two dont care, but we use the harrisons fine so it doesnt take long to warm up anyway. I dont think it would be a problem with the coarse if you left a measured amount out for an hour on the counter in their dish or sealed tub before serving.