Unfortunately, there are no busses that run from POP to the TTC. The POP will take you to MK and then, as mentioned, you can take the monorail to the Polynesian.
If you're feeling really adventurous, you could take a bus from POP to another park (Epcot, MGM) and then take the bus from that park to the Poly. Yeah, it's a little (or a lot) circuitous, but it can also be a heck of a lot of fun!