hobbyhorse
/ˈhɒbɪˌhɔːrs/Definitions
1. noun
a child’s toy, typically a wooden frame with a horse-shaped head, used for riding and balance training
“The child mastered the art of riding her hobbyhorse and performed a flawless routine at the circus.”
2. noun
a person or interest pursued for pleasure in one’s leisure time
“Her hobbyhorse was collecting rare vinyl records and she spent every spare moment searching for new additions to her collection.”