Could it be switched? Yes, but not easily. It would entail replacing the right-hand threaded adjustment nut and the screw it travels on with a left-hand threaded pair
Your friendly neighbor machinist could do that for you ,for a (phe)nominal sum. Or you might be able to cannibalize a nut/screw pair from another plane, but that would entail fitting the LH screw to the frog’s RH hole. Do-able, but would be easier to just replace the plane.