Is there such thing as stones passing in the gall bladder?

Yes: Gallstones often are the source of episodes of intense right upper abdominal pain, often after fatty or large meals. When they are too large to pass, can become a surgical emergency.

Stones : Gallstones are common. They cause no symptoms in two out of three people who have them. They sometimes cause problems such as pain, yellowing of the skin or the whites of the eyes (jaundice), inflammation of the pancreas (pancreatitis), and gallbladder inflammation. Surgery is the usual treatment for gallstones that cause symptoms. https://patient.info/health/gallstones-diet-sheet