anglerpaulm.......Freezing luncheon meat is fine and I do it all the time. Open a tin, cut the contents in half, pop into a cheap 'tear-off' freezer bag (available from all s/markets0 and place in the freezer - lasts for ages and only needs removing the night before for nextday use....I do the same with all meats, hot dogs, etc etc and never been a problem.
As to corn, and I hate waste as well, I open a tin, strain off all the liquid, ans split a large tin into 2 or 3 bags as above....I have noticed that corn, once frozen and then thawed will always be a little softer and continues to become softer at each freezing. Personally I like my corn as soft as possible for silver fish...
If it eventually becomes too soft for hooking then I give it a whiz in a mixer and use it in groundbait...gives a nice could effect BUT you don't need to use too much as it's quite strong smelling.
Almost every other bait, such a s wheat, bread, and all the pulses freeze well and with bread I buy sliced medium, give it a shake , and then freeze it, BUt make sure you close the bag each time you remove some otherwise it does tend (not all brands though!) to dry out a little.
I'm using some tomorrow that's been in the freezer for two weeks and it's still excellent for the hook. Again, any leftovers can be whizzed and frozen for use in a groundbait mix...works just fine!!
Nothing like saving a few bob !!
ps I'm sure you know this but hemp freezes well and keeps for yonks.....