Sneaks, noun plural of sneak. Synonyms in the same form.
Snitch
snakes, narcs, grasses, sneakers, canaries, informers, squealers, tattletales, tattlers, snitches, finks, stoolies, snitchers
Trickster
tricksters
Stalker
stalkers, prowlers
Other
caitiffs, hangdogs
All synonyms for sneak →