Sometimes I think the idea of chicken "toys" is taken to literally.
I do "Habitat Enrichment". Allows the chickens to express natural behavior...
My chickens enjoy having various places in the run to roost and dig/explore. The Christmas tree will go out to their run when it comes down. They get leaves, branches, stumps, wood chips, sand -- different substrates and natural materials at different heights and depths. And they get leafy greens, pumpkins, and oatmeal on really really cold mornings (watermelon on really really hot days) along with scraps like fruit and the rare shrimp peelings.