The crossword solution for the term 'Tweed's Caricaturist' is 'Nast'. Thomas Nast was a German-born American caricaturist and editorial cartoonist in the 19th century. He is considered to be the 'Father of the American Cartoon' and is best known for his creation of the modern version of Santa Claus. Nast worked for Harper's Weekly magazine, where he created cartoons that were critical of William M. Tweed, a corrupt politician from New York City. Nast's cartoons helped to bring down Tweed's political career.