fable-monger (n.)

c. 1300, "falsehood, fictitious narrative; a lie, pretense," from Old French fable "story, fable, tale; drama, play, fiction; lie, falsehood" (12c.), from Latin fabula "story, story with a lesson, tale, narrative, account; the common talk, news," literally "that which is told," from fari "speak, tell," from PIE root *bha- (2) "to speak, tell, say."

Restricted sense of "animal story" (early 14c.) comes from the popularity of Aesop's tales. In modern folklore terms, defined as "a short, comic tale making a moral point about human nature, usually through animal characters behaving in human ways" ["Oxford Dictionary of English Folklore"].

The fable which is naturally and truly composed, so as to satisfy the imagination, ere it addresses the understanding, beautiful though strange as a wild-flower, is to the wise man an apothegm, and admits of his most generous interpretation. When we read that Bacchus made the Tyrrhenian mariners mad, so that they leapt into the sea, mistaking it for a meadow full of flowers, and so became dolphins, we are not concerned about the historical truth of this, but rather a higher poetical truth. We seem to hear the music of a thought, and care not If the understanding be not gratified. [Thoreau, "A Week on the Concord and Merrimack Rivers"]

Old English mangere "merchant, trader, broker," agent noun from mangian "to traffic, trade," from Proto-Germanic *mangojan (source also of Old Saxon mangon, Old Norse mangari "monger, higgler"), from Latin mango (genitive mangonis) "dealer, trader, slave-dealer," which is related to mangonium "displaying of wares."

Not in Watkins or de Vaan, but Buck (with Tucker) describes it as "one who adorns his wares to give them an appearance of greater value" and writes it is probably a loan-word based on Greek manganon "means of charming or bewitching."

Used in combinations in English at least since 12c. (fishmonger, cheesemonger, etc.); since 16c. chiefly with overtones of petty and disreputable (for example ballad-monger "inferior poet," 1590s; scandal-monger).

It is a curious instance of the degradation through which words go, that what was in the Saxon period the designation for the most elevated description of merchant, mangere, is now only a term for small dealers, and principally in petty wares, monger. [Thomas Wright, "Anglo-Saxon and Old English Vocabularies," 1884]