I find the fat in pork sausages can taste rancid in sausages that have been frozen 4 or 5 months. Might depend on the pig or how cold the freezer is . I haven’t frozen lard by itself.
I stopped freezing my duck fat. I keep it in a small pyrex dish in the fridge for a few weeks after roasting a duck, then toss it. My last duck gave me about 2 cups of fat.
