Nevalyashkas (van'ka-vstan'ka) or better known as "Roly Poly" are traditional Russian Toys. They never fall over but wobble from back and forth, ringing a little bell inside. A roly-poly toy also known asround-bottomed doll, tilting doll, tumbler or wobbly man is a round-bottomed toy, usually egg-shaped, that tends to right itself when pushed at an angle, and does this in seeming contradiction to the force of gravity. When such a toy is pushed over, it wobbles for a few moments while it seeks the upright orientation.
Children in Russia have been playing with these dolls for many years.