Plaything (noun)

1. An object used by a child for play or entertainment.
2. An object or toy that is used for amusement or entertainment.

Origin:

The term "plaything" is likely formed by combining the words "play" and "thing".

Examples:

1. The ball was his favourite plaything.
2. The doll was her favourite plaything.
3. The action figures were his favourite plaything.
4. The toy train set was his favourite plaything.
5. The stuffed animal was her favourite plaything.