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Thats fine. 12 gauge is appropriate for the load.The plan is to buy a 12 gauge extension cord with a single outlet to power the fridge for an hour and then switch to the freezer for an hour.
Unless your fridge and freezer are ancient, you can plug both of them in at the same time no problem.
Get a triple tap 2 ft extension cord adapter, and that way you only have to run one cord into the house. You can use the other two outlets to charge your devices.

2 ft. Triple Tap 3 Outlet Extension Cord
Amazing deals on this 3-Way Grounded Power Outlet W/ 2 Ft. Cord at Harbor Freight. Quality tools & low prices.