Dupes, noun plural of dupe. Synonyms in the same form.
Sucker
suckers, victims, gulls, stooges, rubes, tools, chumps, marks, fishes, cullies, pigeons, saps, greenhorns, cat's-paws, mugs, patsies, sapheads, culls, gudgeons
Other
put-ons, dotterels
All synonyms for dupe →