Yes I keep all my feeder rodents in the freezer and I'll soon be switching over to a 7 cu ft chest freezer since my rodent requirements are exponentially growing 
I would recomend against using the refridgerater part of your fridge/freezer for anything other then 1-2 day storage. Mainly because I don't know how long they last there. If you keep your rodents in sealed containers(prefferably vacuum sealed) they will keep for 9-12 months in the freezer.
Personally if you cannot find feeder rodents locally for about a dollar or less per mouse I would order frozen ones online. Even with the increased price of a small order shipment you will save alot if your alternative is paying over a buck a mouse. ideally if you can find other reptile keepers in your area you could arrange to go in together on a order to cut the shipping cost by placing larger orders.
Hope this was helpfull.
Sean.
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1.1 BRB
1.1 Triple Het TPRS's
1.1 Amel Bloodred Corns
0.1 Abbott Okeetee Corn
0.1 Blizzard Bloodred Corn
1.1 Thayeri Kingsnakes
0.1 Reeve's Turtle
0.2 Amstaff's
1.0 Pudytat