You squealer.

May I introduce Plyne the squealer?

A squealer that's what I'd call you.

While Napoleon and Squealer made plans for Boxer,

We once had a squealer in the gang, but now he ain't got no teeth.

The success of their effort delighted everyone, including the sly Napoleon and his constant companion, fat pig Squealer.

Napoleon stepped up confidently to take charge of Animal Farm, and fat pig Squealer became his obedient follower and assistant.