Question

What is it called when a cat kneads the ground?

Answer 1

The behavior of a cat kneading the ground is called "making biscuits". This behavior is typically seen when a cat is feeling relaxed and content. It is thought to be a remnant of the behavior of cats kneading their mother's fur when they were kittens.

Answer 2

It's often referred to as making biscuits. Other expressions can be muffin making and dough making . This is moving their paws in recurring  pattern resembling dough making