What is another word for tattle tale?

Here are some other words for tattletale, depending on the context and nuance you want to convey:

Neutral:

* Snitch

* Informant

* Telltale

* Whistleblower (for serious matters)

Negative:

* Gossiper

* Squealer

* Fink

* Rat (very informal and negative)

* Backstabber

* Betrayer

Formal:

* Informant

* Complainant

* Whistleblower

The best word to use will depend on the specific situation and the tone you want to convey.