Hello Losttheplot, I can't imagine what happened to two sheds frozen veg. But I would say, no you don't have to blanch.
I prepare the veg as for using, spread it out on a tray, put in the freezer to open freeze, then put into a freezer bag. Comes out perfect after months.
Works for carrots, leeks, celery, turnip, beans and herbs.
I think the trick is not to go for gluts, but to organise the ground to produce fresh all the year round and eat in season. That's the one I'm trying to do.

__________________

From each according to his ability, to each according to his needs.