A Verdant Green; a newly-enlisted soldier; an adult apprentice in the ship-trade.
“The impulse given to ship-building by the continental war, induced
employers to take persons as apprentices who had already passed their
majority. This class of men-apprentices, generally from remote towns,
were called `Johnny Raws' by the fraternity.” —
Source: Dictionary of Phrase and Fable, E. Cobham Brewer, 1894