The Secret Squirrel Show (1965)

S1E9 Operation Broom Switch

Two spies swipe Winnie's broom and swap it for an ordinary one. When they discover they can't make it fly, they bring it back to Winnie, insisting she reveal the secret words. Winnie takes the opportunity to give them a rough lesson on broom flying, ultimately chasing them off and transforming them into frogs.