(n.) A raw, inexperienced person; one easily imposed upon.

abecedarian alphabetarian apprentice arriviste articled clerk babe baby beginner boob boot catechumen chump cinch credulous person cull dabbler deb debutant dilettante dull tool dunce dupe easy mark easy pickings emigrant entrant fall guy fish fledgling fool freshman gate-crasher gobe-mouches greener greeny gudgeon gull ignoramus illiterate illiterati immigrant incapable incompetent inductee infant initiate innocent intruder know-nothing leadpipe cinch learner lowbrow mediocrity middlebrow monkey neophyte nestling new arrival new boy newcomer no conjuror no scholar novice novitiate novus homo parvenu patsy pigeon plaything postulant prize sap probationer probationist puddinghead pushover raw recruit recruit rookie sap saphead schlemiel settler sitting duck squatter stooge stowaway sucker tenderfoot toy trainee trusting soul tyro unintelligentsia upstart victim