No! You definitely cannot feed grapes to your hedgehog as this fruit is known to cause renal failure almost right away for some hedgehogs. There is no reason to be feeding grapes to your hedgehog because there are too many risks involved.
Vets aren’t exactly sure what causes the issues. It could be the skin of the grapes or maybe the seeds but something in grapes are not good for hedgehogs to eat and therefore it is just best to avoid this fruit altogether when it comes to your hedgehog.
Stick to other safe fruits for your hedgehog instead. Don’t take the risk.
If you need more details about grapes and your hedgehog you should contact your local pet shop or your vet to get more details but don’t try feeding grapes to them at all.