Is the pope Polish?

Not any more. But this does not prevent him from addressing Poles on St.Peter's Square in their native language.

Yesterday, he said this to the crowd: Pozdrawiam obecnych tu Polaków. W tych dniach razem z wami oddaję cześć świętemu Stanisławowi i polecam jego opiece cały Kościół w Polsce. Z serca wam błogosławię. Niech będzie pochwalony Jezus Chrystus!*

A mouthful for a non-Pole, wouldn't you say?

* translation: oh, it's just the usual religious stuff, with a focus on St. Stanislaw and the Polish church.