Cobnuts

www.thespruceeats.com/what-are-cobnuts-435410
Still learning? So if cultivated they're cobnuts, wild ones are hazelnuts - so you were right ?

Then to add to the confusion there are Filberts: www.rhs.org.uk/nuts/cobnuts-filberts
essentially the same thing.

If you're in Kent, they're cobnuts....

I thought it was just a regional difference in names.

I've just been watching our resident squirrel collecting nuts from the hazel tree. He buries them all over the garden, we're always pulling up tiny trees.

I have found cobnuts in the garden, obviously dropped by a squirrel as we don't have a tree and neither does either of my neighbours so the little blighter is probably burying them here and there. We have a big oak tree at the bottom of the garden and I am always finding buried acorns in the pots when changing the soil as well as little oak trees sprouting everywhere.

In cumbria the wild ones are wood nuts the ones at Christmas are hazelnuts.
Talking of animals hiding things in my previous we had a very cold winter and thought the Rosemary I had in a pot was doing well, it was only when everything melted and there was an awful smell we realised a fox had put a pheasant tail side up and buried it.

As far as I know, hazelnuts and cobnuts are the same thing. The difference in names is because cobnuts are the cultivated form of hazelnuts.