A franceman
A person who’s too proud to admit they’re not French, even when they’re clearly not.
He refused to admit he wasn’t French, even though he couldn’t speak French and hated croissants.
She said she was a Franceman because she once saw a Frenchman on TV and thought she looked like him.
He claimed to be a Franceman just to make his girlfriend feel special, even though he didn’t know what ‘bonjour’ meant.