Noun: Hobbyhorse (HAH-bee-horss)
1. a: A stick having an imitation horse’s head at one end that a child pretends to ride.
1. b: A rocking horse.
1. c: A toy horse suspended by springs from a frame.
2. A topic to which one constantly reverts.
Sample sentence: The intricate toys like the hobbyhorse and tiny working carriages were made for child play before the eras of radio, television, electronic games or Internet.