a nark is a slang word for 'informer' especially to the police. Or generally to inform against someone
Some slang terms for arsonist are firebug, torch, and pyro.
Here are some slang terms for potatoes:SpudsTatersMurphyTots
In British slang to act as a police informer, also someone who complains irritatingly. In Australia to annoy or upset or nag
fine
The slang terms I'm familiar with are: P.I. Private Eye, Peeper and Dick
Here are some examples:CarJalopyFlivverRide
bucksgreenbacks bills
Angel dust
Hoops, bangs
Pito grandote
shela
Fabu. or Fab.