Kill them and then freeze them separately. You don't want to freeze a live animal because it is slow and painful. Like it will take an hour or more. If you don't separate them then you will get a big rat chunk because they will be stuck together and you won't be able to defrost them one at a time.
I vaccum seal mine for freshness.
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0.1 Rubber Boa
1.0 Eastern Hognose 2003 super red
0.2 Eastern Hognose Snakes
3.3 Western Hognose Snakes
1.0 Durango Mountain Kingsnake
1.1 Woma's (new!)
Spadefoot
Black Knobbed Sawback
Northern Diamondback
Florida Redbellied Slider
Western Painted
Southern Painted
1.0 African Hedgehog
1.0 Sulcata
1 Pleco
2 Silver Dollars
3 Bosemian Rainbows
1 Cory Cat
1 Upside Down Catfish
2.0 Fire Guramis
uhh... I think that is it.