Are Chaoshan people descendants of Minnan people?

Yes, it is a descendant of Minnan people.

There is a saying in Chaoshan area-"chaozhou people is the ancestor of Fujian", which means that most of chaozhou people's ancestors came from Fujian. Because of this, chaozhou people has a special name-Fu Laoren.

Since the Jin Dynasty, war has been an important reason for the people of the Central Plains to move south. All the way south, they stopped in Fujian and took root. However, after the Anshi Rebellion in the Tang Dynasty, the society was once again in turmoil, and many families who settled in Fujian had to continue to move south and set foot in Chaoshan.