I would emphasize that I am not very experienced with BARF feeding but I have frozen chicken wings, defrosted them & fed them to the dogs so far with no ill effects.
I've kept them in the freezer for up to 4 weeks, again with no ill effects.
I have also given the dogs sardines; usually the ones in tomato sauce & the dogs really love them.
I must admit I keep lamb breast & bones from the butcher in the fridge for up to about 5-6 days & they seem to be alright.
Sorry I'm not very scientific about it!!