1) Beans spiller 2) Betrayer 3) Blabber 4) Canary 5) Fink 6) He rats to the cops 7) He sings; lies, too 8) He told cops about seat, IE 9) Info cougher-up 10) Informant 11) Informer 12) Informer, to a cop 13) Kind of a rat 14) One who sings 15) Police informant 16) Police reporter 17) Police snitch 18) Rat fink 1) Canary 2) Fink 3) Rat 4) Snitch 5) Stool pigeon 
Stoolie is American slang for a police informer.