Foolery! This is where I ended up when the word history of fond took me back to foolish and then to fools (the good and the true). And then to the realisation that there is a whole swathe of foolery to consider.
Does it come from Latin’s follis (windbag, empty headed person) in the idiot sense?
Or folles (“puffed cheeks” of the buffoon) for shades of jester?
Or is the question moot because folles, here, is a secondary meaning of the plural of follis?
And don’t get me started on moot. Yet.