Synonyms for tattletale
- fat mouth
- stool pigeon
EXAMPLES FROM THE WEB FOR TATTLETALE
He wanted a dog to help him hunt, but he did not want a tattletale.
That First Lieutenant of ours either has eyes in the back of his head or else the Sergeant is a tattletale.
Course, I didn't need to worry, because Stinky told them all right, just like a tattletale.