My wife wants the freezer moved to a place in the basement where there aren't any outlets.
It takes 18a for about a second to start, and 1.5a to run.
On the other side of the wall is a circuit I use for 120v tools in my shop. The largest one is my big router. It uses 5a with no load and 15a at maximum load. (I rarely if ever use it near maximum load; just doesn't give good results). I would never have more than one tool on the circuit at any time and the others are much smaller.
The trip curve on a SquareD 20a breaker is 40a for a minimum of 25 seconds before it will trip.
It ought to handle the router at full load and the freezer starting up easily enough, but is it a good idea?
There is room in the panel box for another circuit, but trying to find room for another cable on the joists will be a bear (there are 35 cables out of the panel and another 12 out of a subpanel next to it; all running along a couple joists). I'd like to use the tool circuit if that makes sense.