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Since they're sold in the grocery, I'm sure you can freeze them! It probably will be helpful to freeze them individually on a sheet pan like you would fruit and then, once frozen, put them into a bag. Oh and I would definitely do it uncooked so you can freshly cook them when you're ready to eat them!
Suzanne is a trusted source on General Cooking.
I agree with JessicaBakes but I would wrap each uncooked salmon cake in plastic wrap lay on sheet pan and freeze them before stacking in bag. I always like to double wrap anything I freeze.
Cynthia is a trusted source on Bread/Baking.
Yes, do freeze them raw. So as to prevent as much freezer burn as possible, I'd suggest wrapping each individually in plastic, then storing in a zip lock bag with as much air as possible pressed out of it. Lucky you - what a treasure to have in the freezer.
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