The clues: The Turtle makes it clear early on that they started their career "surrounded by other hungry newcomers," which could mean they were a former child star. Throughout the video, there are a lot of other random clues, such as the Turtle waxing a surfboard and flipping burgers. The Turtle also mentions how they've taken their career "step by step" which could be a reference to the actual '90s show of the same name.
Who it might be: After hearing the Turtle sing, many fans believe Jesse McCartney is behind the mask. Not only did the singer get his start at a young age (on the soap opera All My Children and then in the boy band Dream Street), but the surfboard could be a reference to his stint on the WB series, Summerland.