"The Boy Orator of the Platte" is a well-known moniker that refers to William Jennings Bryan, an American politician and lawyer who gained popularity in the late 19th and early 20th century for his oratory skills. However, there are a number of other synonyms that can also be used to describe Bryan. For example, he was often called the "Great Commoner," as he was a staunch advocate for the working class and often spoke on their behalf. Additionally, he was dubbed the "Champion of Silver" for his campaign to establish a bimetallic standard for US currency. Other synonyms for Bryan might include "stirring speaker," "eloquent advocate," or "convincing communicator." Regardless of the label used, it's clear that William Jennings Bryan was a powerful force on the American political scene and remains an important figure in history to this day.