They would probably enjoy the play house. I have two small ones, a plastic doll house one and a smaller wooden doll house. They both are two story and open in the back. The plastic one I used do so many things with my ducks and geese. From an entry for a temporary run to nesting boxes.
Last year I Just had it out in the pasture they were spending most of their time in, and I would often time find the ducks jumping up into the second story, just because they could.
Right now I’m using the small wooden one as a nesting box for those ducks, and they have been enjoying it before they even started laying this spring. I would find one on each story and sometimes I’d find one on the roof. Now that they’ve started laying they have been climbing and jumping on it a lot less, pretty much it’s only for their eggs now.
On the comment of chickens are not kids, I unintentionally made my chickens a swing. I was attaching a new roosting bar in their coop and had one end tied up with twine while I made sure it was level and worked on attaching the other end. It’s now a permanent swing as my rooster loves rocking it back and forth.
Birds are also attracting to colors and things that do things, especially geese. I have a small collection of baby and toddler toys just for my geese. Their favorite are the stacking ring toys and one loves the toys that you clip up and when pulled on it shakes and vibrates back up. She will grab it, shake it and fully extend it, watching it retract and then do it again.
The pool ring sinkers are popular to. They like fishing them out. They run around with them. One goose will try to get all of them around her neck(so now it’s a supervised toy)
I do have a xylophone for them, you arnt big into it after they figured it out but the ducks like to walk on it and kit the keys with their bills. My ducks and chickens also love the little plastic cat balls with the bell or rattler inside. The ducklings especially. It’s like a fluffy soccer match