The term "Return of the Silver Tongue" is not widely recognized as an established concept, historical event, or major work in general encyclopedic sources.
Possible etymological interpretation: The phrase combines "silver tongue," a common idiom dating to the late 16th century describing a person who is eloquent, persuasive, or gifted in oratory, with "return of," suggesting a recurrence, comeback, or sequel involving such a figure or trait.
Plausible contextual usage: The construction follows titling conventions for creative works (novels, films, game quests, episodes) where a character known for persuasion or rhetoric reappears, or a lost skill of rhetoric is regained. Without verifiable publication or historical records, specific references cannot be confirmed.