Sandstorm's name is Conjectural. No official name has been given, and it is subject to change at any time.
Sandstorm was the unnamed Quirk possessed by Snatch.
Snatch's Quirk gave him the ability to transform his upper body into sand. He could manipulate this sand freely, making him capable of expanding the sand and shaping it into different forms.
Snatch could attack, defend, and restrain opponents using his Sand. The sand created by his Quirk allowed Snatch to repel Dabi's flames on two different occasions. By transforming his body into sand, Snatch was also able to negate Tomura Shigaraki's Decay Quirk since Tomura couldn't get a grip on his body.
Snatch could transform his limbs into sand at will. He could turn his arms into sand and expand them in order to attack or grab his target. He was also capable of shaping it into a tiger form to attack.