I would say, How bad is it leaking??? A drip, a stream ????
It is not unusual for freeze plugs to leak a bit if they were installed DRY. A heat cycle or two may correct a small drip. A stream not likely. A lot of suppliers of reman or even new engines recommend their "sealant of choice" for cooling systems on install of the motor.
So a minor drip, MAYBE, a steady leak, not likely the long term fix I would be comfortable with. Hope this helped to some degree