In freeze desalination, the initial ice crystals before it freezes solid are pure water; you mostly freeze a volume of saltwater into slush, strain out the ice, and discard the liquid (which will be bribe; higher in salt than your initial water).

Probably not super efficient, and probably needs multiple steps, but I dunno. Somewhere where the ambient temperature is below freezing, but geothermal is available, it could work at scale, but if you have to refrigerate, you’re probably better off with regular distillation