Here's where you can find the medallions:
* Medallion 1: In the Captain's Quarters, behind a loose brick.
* Medallion 2: In the crow's nest, behind a loose plank.
* Medallion 3: In the ship's hold, hidden inside a barrel.
The medallions are important because they help the gang decipher the riddle and find the real treasure, a collection of valuable jewels.
It's important to note that Scooby-Doo! First Frights is a separate series from Scooby-Doo! Mystery Incorporated.
Let me know if you have any other questions!