[cypher]

Plywood isn't really considered safe for hams, I think the problem is in the glues that are used, not entirely sure tbh but it is usually best avoided.
Some hamsters will enjoy chewing on hazel, willow & apple twigs, you can buy all those but if you want to pick your own then you would probably need to bake them first to avoid any potential issues with anything living in them & bacterial problems.
There are quite a lot of hamster safe plants but personally I think it better not to forage for hams, you can never know what may have been on the plants, mice for instance carry diseases that can kill hamsters so it's probably better avoided.