How long did you let it stand upside down in the freezer? If you leave it for longer, it decreases the chance of the melting because most residual naphtha will have fallen to the lid.
If nothing else works, you can just let the oil stand outside and air dry, scrapping and re-scrapping it so that it hardens up. Once it does, you can either smoke as is (make sure all solvent is evapped), or recrystallize it and finish up either with freeze precipitation or simply with slow evaporation.
Hope it helps