During the Great Depression, homeless Americans lived in cardboard boxes in communities known as shantytowns. What name was given to these "towns" to show frustration with the President?

They were named after Herbert Hoover (Hooverville), who was President of the United States of America during the Great Depression and was widely blamed for it.

These "towns" were named Hoovervilles, as a way to show frustration with President Herbert Hoover.

Explanation:

Hooverville is a term that designates a series of shanty neighborhoods that appeared in the United States during the Great Depression, from 1929 to the 1940s. The term "Hooverville" was created based on the name of the 31st United States President, Herbert Hoover, in exercise at the beginning of the Great Depression.

These neighborhoods, usually implanted on public or abandoned lands, were made up of tents or cabins where the unemployed and the homeless lived in this period of economic crisis. These were not recognized by the government and were thus periodically dismantled by illegal occupation of private land. Most of the constructions were made of wood, cardboard, plates, tubes or all kinds of materials available. Hunger and extreme poverty led the Hooverville occupants to begging and clashes with the forces of order.