Let me just throw out all at once these idioms about this guy.

All talk and no action

All sizzle and no steak

All foam and no beer

All glitter and no gold

All tail and no cock

All fart and no turd

All broth and no beef

All smoke and no fire

All mask and no measure

All rhyme and no rhythm

All sound and no fury

All squawk and no scratch

All frank and no beans

Stolen from a Google search.