Easy songs to sing are songs by country pop singer Taylor Swift. Her range is small in most of her songs and they sound super nice when you sing them. Others are songs like "Only Exception" by Paramore. I find that song simple to sing. Selena Gomez's songs are super easy to sing, too.
Research has not provided results for songs that were sung by the penguins in the movie Madagascar. There is an animated television series that is called The Penguins of Madagascar and there is a theme song for this program that has the same name.