You say you don't care about the well being of the mouse and then in the next breath say you don't condone mistreating animals...
Snap its neck. Or a stiff, blunt force to the head. Make sure it's actually dead though and not just stunned so that it doesn't wake up in the freezer and panic.
As for the dead/frozen mouse being in your freezer... As long as your food you have in there is properly sealed and the mouse is properly sealed you won't have anything to worry about. I keep up to a couple hundred frozen rats in my freezer at a time. Granted they're sorted by size and stored in their own container, but I've never had issues. (And no one else I know has either.)
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