greenhorn

märkäkorva, keltanokka puhekieltä an inexperienced person; a novice, beginner or newcomer
1847, George Frederick Augustus Ruxton, Adventures in Mexico and the Rocky Mountains (page 267)

The powers of the Canadian voyageurs and hunters in the consumption of meat strike the greenhorn with wonder and astonishment; and are only equalled by the gastronomical capabilities exhibited by Indian dogs, both following the same plan in their epicurean gorgings.