While I don't agree with my Trinitarian friends here that God is a nature and Jesus a hybrid of dual natures, they are 100% correct that most JW's do not know anything about the mainstream Trinitarian theology. While I still agree there would be no need for Jesus to pray to his father if they shared the same Omnicient "nature", in their current evolution of understanding that doctrine, the explanation works against that arguement.
So Jesus and his father according to Trinitarians are indeed separate people, but are both "God" in the sense that God is a nature (such as human is a nature), and not a person.
While I do not believe this is biblical, it is what Trinitarians believe. So when I explained this to any JW (even when I was swimming in Kool-aid), they gave me this weird look like I was defending the doctrine.
It was maddening.
p.s. - On the polytheism note, calling Jesus "a god" in no way is accurate as it relates to polytheism, as the arguements above are to actual trinitarianism.