I saw a couple of episodes of Foster’s Home for Imaginary Friends (by Craig McCraken?). I really got a kick out of it, especially how innocently naive Blue is. But I was wondering, does Frankie have an imaginary friend there? Even Madame Foster has one (the Rabbit Butler)
To date, no, Frankie has no IF. Which isn’t to say she couldn’t in the future; we’ve seen Mac’s brother Terrance create his own friend specifically to assualt Bloo.