Unfortunately, the TTC is no longer the hub for buses, Downtown Disney is. So the best way to meet at the Polynesian during Park hours is to take a bus from POR to MK and then transfer to the Monorail or to a boat.
If the MK is not open, the only way to get between the resorts is to take a bus to Downtown Disney and then transfer to the resort bus (this can take a long time if you aren't lucky making connections).
You can also take cabs from one resort to the other, something to consider if it's very late at night or you need to be somewhere at a precise time.