The Shwell Girls are a female turtle pop band. They are Sheila's big sisters, legal guardians and the oldest daughters of Chantelle, a famous singer, and Neil the famous shellboarder.
- Like Sheila, the Shwell Girls say "Whoa Shelly!" when they see something surprisingly unexpected.
- All three of the girls were born on the same day and are 10 years older than Sheila; however, Michelle is the first one to be hatched.