Saps, noun plural of sap. Synonyms in the same form.
Fall guy
suckers, ding-a-lings, fools, gudgeons, pigeons, mugs, chumps, jerks, mutts, dupes, mugginses, tomfools, stooges, culls, schlemiels
Cosh
coshes
Saphead
sapheads, milksops
Other
juices, run-downs
All synonyms for sap →