That's what they say but I think they look dopey so never keep 'em. Don't seem to respond to flies like a redfish.
Also Sheepshead hits flies fairly regularly. Good fighters but a booger bear to clean, sharp fins and tough bones. You'll find these most often around oyster reefs but hard to target. Kind of a target of opportunity.
Look at the pic's, bring a net!! All of the fish have teeth and are very tough to handle. Flounder are close to impossible to handle without one.