Season's Greetings from the Hatchlings of The Angry Birds Movie. The children who voiced the Hatchlings in the movie were asked to sing Deck the Halls, and it turned out none of them really ... Read allSeason's Greetings from the Hatchlings of The Angry Birds Movie. The children who voiced the Hatchlings in the movie were asked to sing Deck the Halls, and it turned out none of them really knew the words.Season's Greetings from the Hatchlings of The Angry Birds Movie. The children who voiced the Hatchlings in the movie were asked to sing Deck the Halls, and it turned out none of them really knew the words.