Samdive...Her name is Natasha...And she is actually supposed to be a hippo...Her and her other Backyardigan friends frequently go submarining, diving and freediving...Not to mention sailing and fishing too!
I know their intro song by heart...

as does my 20 month old son...But he just mumbles the words as he spins in circles!
If you want a Mermaid model Ill do it real cheap...Just get me away from all these cryin' babies! HELP! AHHHHH!!!!!!!