On 25 February 1862, Abraham Lincoln issued an emergency currency called “greenbacks” during the US civil war.

GREENBACK DOLLAR - Hoyt Axon - 1962

And I don't give a damn about a greenback dollar
Spend it fast as I can
For a wailing song and a good guitar
The only things that I understand, poor boy
The only things that I understand

https://www.youtube.com/watch?v=AFQHzbQlkVE Greenback Dollar
The Kingston Trio Live in Concert 1965

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Many other recordings on YouTubehttps://www.youtube.com/results?search_query=Greenback+Dollar+
Greenback (1860s money), article from Wikipedia     https://en.wikipedia.org/wiki/Greenback_(1860s_money)
Hoyt Axton, article from Wikipedia    https://en.wikipedia.org/wiki/Hoyt_Axton