How to freeze potatoes, and other things, I suppose

you want to get them to freeze as quickly as possible afaik about freezing things. the quicker it freezes the less integrity of the product will be compromised/lost. i still don't know if you can do this successfully in a home kitchen with potatoes. but after you parboil, cool them down on as quickly as possible (if you cool in the fridge preferably on a metal cookie sheet they'll take less time to freeze). then i'd put the sheet pan they're cooling on in the freezer and get them well frozen before putting into a storage container.
seems like a huge hassle. why do you want to do this?

Since they're not a "more expensive out of season" item, it never occurred to me to try. I think frozen french fries are par-fried, not parboiled. xp

I've only successfully frozen (partially and fully) cooked potatoes. Ore-ida cooks and coats with oil before freezing so all you're doing is reheating/crisping.

what happens when you freeze a raw potato?

it goes gross and sweet iirc