newcomer from the countryside to the city / (by extension, of a person) unexperienced and appearing suddenly in a field (such as entertainment)

突きん棒: (fishing) harpoon used for catching fish like marlin or tuna

物真似: imitation of people or things

(archaic, literary, formal) indicates the patient of a causative expression; used with the auxiliary verb しめる (shimeru) to mark the causative