Greenhorns, noun plural of greenhorn. Synonyms in the same form.
Tyro
tyros, novices, rookies, neophytes, newcomers, amateurs, beginners, apprentices, trainees, ignoramuses, fledglings, learners, probationers, recruits, novitiates, initiates, tenderfoots, abecedarians, probationists, alphabetarians, cheechakos
Other
cubs, suckers, gulls, gudgeons, dupes
All synonyms for greenhorn →