I don't know who the first person is. Bow Wow I know of but don't listen to his music and it would be nice if it was Taraji B. Henson.Final guesses before the finale.
Turtle: Going with my February guess of Jesse McCartney (One of the few boy band singers I know)
Frog: Going with my original guess Bow Wow. Really the only one I know.
Night Angel: Really no clue. Only guess is Taraji Henson