This is the 2nd Sing-a-ma-jig Quartet. The big one is orange, has the same ears as the Tangerine Sing-a-ma-jig, blue circle eyes, a green nose, a blue mouth, the same hand pose as the Teal Sing-a-ma-jig and the same feet as the Lime Sing-a-ma-jig. Each baby has the same ears, hands and feet as the little one from the Orange duet. The blue one has black star eyes, a green nose and a yellow mouth. The green one has red circle eyes, a fuschia nose and an orange mouth. The pink is not exactly like the little one from the Orange duet because it has a blue and green striped nose and a blue mouth.
They sing Clementine.
Here's how they sign on, enter song mode and sign off.