* A collection of toys
* A box of toys
* A set of toys
* A pile of toys
* A treasure trove of toys
You can also use more creative options depending on the context, like:
* A menagerie of toys (if there's a variety of animals)
* A battalion of toy soldiers
* A fleet of toy cars
* A swarm of stuffed animals
Ultimately, the best collective noun for toys will depend on the specific situation and what you want to emphasize.