I’ve frozen collards and kale when I had way too many; blanched and froze.
Buying to freeze is not great around here, produce prices high. Usually I can a lot from UPick places or get wild blackberries, or neighbors with too many plums, cherries, etc. I like canning fruit better than freezing because if power goes out I don’t worry.
Canning has great value. Some items are better canned than frozen, too.