A toy car was a type of toy designed to resemble a car.
In 2369, Alexander Rozhenko had a toy that appeared to be some type of remote controlled hovercar.
Jean-Luc Picard, who at the time had been turned into a child due to a transporter accident, asked him if he could borrow it. He then used it as a diversionary tactic to retake his ship, which had been taken over by a group of Ferengi. (TNG: "Rascals")
In 2399, Deanna Troi kept her late son Thad's toy cars on a shelf next to a model hadrosaur. (PIC: "Nepenthe")