The term "quack" has been employed in literature with remarkable versatility, serving both as an onomatopoeic representation of a duck’s call and as a derogatory label for charlatans and incompetents. In fairy tales by Hans Christian Andersen, for instance, the word is playfully used to mimic the sound made by ducks ([1], [2], [3], [4], [5], [6], [7], [8]), adding a musical, lighthearted element to the narrative. In contrast, authors such as Thomas Carlyle and Charles Dickens use "quack" to criticize hypocrisy and fraudulent behavior; Carlyle's writings satirize insincere figures with phrases like “the wretched Quack-squadron” ([9]) and “the substance of him continues” despite alterations ([10]), while Dickens deploys the term in humorous dialogues that blur human and animal expressions ([11], [12], [13], [14], [15], [16], [17], [18]). Additionally, “quack” appears in contexts critiquing dubious medical practices in works by Edgar Allan Poe, Mark Twain, and even Bernard Shaw ([19], [20], [21]), reinforcing its dual role as both a literal sound and a metaphor for deception.