Several sources say that grape vine and leaves are safe, as long as there are no pesticide residues.
As far as the tunnels go, it depends on if they chew them! My buns had a cat tunnel that I think was the jackson galaxy brand and they left it alone for the most part (an occasional nibble but nothing major). But then I got a new one that I didn’t realize was crinkly and they immediately tried to chew it, so I removed it! So prob worth a try to see if they will mess with it or not. I imagine ones for kids might be very large though, so the cat tunnels might be more fun for them.
Now they have a concrete building form tube (from the hardware store) with the inner lining removed. They are cardboard so it’s safe if they chew it and I don’t have to worry.
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The answers provided in this discussion are for general guideline purposes only. The information is not intended to diagnose or treat your pet. Seek the advice of your veterinarian or a qualified behaviorist.