What is another word for tattletale?

Here are some other words for tattletale, depending on the context and desired tone:

Neutral:

* Snitch

* Telltale

* Informant

* Whisker

* Squealer

* Rat

Informal/Negative:

* Gossip

* Busybody

* Meddler

* Stool pigeon

* Fink

* Grass

Formal/Negative:

* Traitor

* Betrayer

* Informant (used in a negative way)

The best choice will depend on the specific situation. For example, "snitch" is a more neutral term, while "traitor" carries a much stronger negative connotation.