The Dino Files #3: It's Not a Dinosaur!;

A new reptile is swimming up to Frank’s campsite . . . and it’s not a dinosaur!
 
Frank and his cousin Sam believe anything is possible. They have a pet dinosaur, after all! So when Frank’s dad tells them he saw a Nothosaurus in the river, they can’t wait to look for it on their camping trip. The Notho is a prehistoric reptile, not a dinosaur . . . but is she dangerous? There’s only one way to know for sure: find that dinosaur—er, reptile!
 
The hilarious Dino Files chapter book series follows a nine-year-old dinosaur expert, his paleontologist grandparents, a cat named Saurus, and dinosaurs that aren’t so extinct