truffle hunting in tuscany and umbria

Are you a dog or a pig?
Both are really good at it, if properly trained.
If you are a human, you will need one of the above mammals to find some.

I'm human and you? I was looking for a group to hunt with

I'm canine.

Try and google CACCIA AL TARTUFO and you might find some websites for organized truffle hunt excursions accompanied by members of my own species.

Some of those websites may have an English language page, or you can use Google translate if not.

Happy hunting.

Woof, woof!

Don't have a company name, but when I was in Trevi last year, several people I met were part of a group going truffle hunting.

You could try contacting via email the Tourist Information offices in a few cities to see what they offer.