@JeremyECrawford if a PC is polymorphed into a troll (by polymorph spell) does PC retain languages, or can only speak giant?
— David Pozorski (@DavidPozorski) July 7, 2015
If transformed by the true polymorph spell, the creature would speak what the new form speaks. https://t.co/Tm8MEOc4do
— Jeremy Crawford (@JeremyECrawford) July 8, 2015