Greetings! Concerning the Catapult spell, you can magically launch an object of your choice (rocks, skulls, vials, etc.) that weigh between 1-5lbs up to 90ft in a straight line, but can you also launch small creatures? Say a Frog, Rat or Quipper? No.
— Jeremy Crawford (@JeremyECrawford) March 7, 2018