Debunked might fit.
It is usually used as a verb or an adjective. It can be used as an adjectival noun also but that usage is not common. (For example: debunking the debunked.)
Debunker is the one who debunks.
In a very few sources, debunkee is used as a neologism or a nonce word for the one who gets debunked.
: to expose the sham or falseness of
: to show that something (such as a belief or theory) is not true : to show the falseness of (a story, idea, statement, etc.)
Disclosed comes to mind also but it is used as an adjective mainly.
made known (especially something secret or concealed); "the disclosed purpose of their wicked plan"
Note: Of course they can be called many things like crook, sham, phoney, double-dealer, counterfeiter, faker, scammer, fraudulent, trickster etc. depending on the context but the key point is being found out/discovered.