The mercenary Lang owned a BARM-ST12 scattergun; during his battle with Ahsoka Tano he fired a blast of bolts at the Jedi but ultimately missed - by the time he had pumped his weapon for a followup shot, the Jedi was already aware of his presence.
While blaster shotguns have existed in Star Wars Legends for many years, the scatterblaster was brought into wider canon onscreen in Chapter 13: The Jedi of The Mandalorian; very briefly, the character of Lang fires his BARM-ST12 scattergun at Ahsoka Tano while she is on a rooftop, revealing that his weapon fires 4-5 blaster bolts simultaneously. In the same scene, Lank cocks his weapon through pump-action.
- Star Wars: The Mandalorian Handbook