Freezer burn is a normal & "cosmetic issue"- your snake won't really care. But for maximum freshness, minimize the air your "ratsicles" are exposed to in the freezer.
Best way is to separate & vacuum seal, & that way, they can last easily a year. For only 3 snakes, & to save money by ordering quantities of 25, yes, that's what you should be doing. Or at the very least, rewrapping them individually (or with only a few) with as much air pushed out as you can in zip-lock baggies. You could put those in a plastic snap-top container too, or even a coffee can, for extra protection.
No matter how long my rodents are frozen, I always give a sniff test when thawed, & certainly take the snake's "word for it" if refused. Freezing doesn't kill germs- it only arrests their development. Sometimes sources don't use the best (fastest) methods to freeze after euthanizing, (or maybe you've forgotten about that power failure?) allowing some spoilage to occur. But again, freezer burn is not actual "spoilage"- just some dryness.
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