Hi Sandra Blacks in the freezer yes, Your Pecan truffles actually could live happily in the fridge for a while too as they are fresh specimens, just chaining out the paper towels daily, but freezing is totally fine too 🙂
As for trees. The trees in the “whatisthis” They look like Alder/ Red alder. Fine, they aren’t bad, but they don’t tend to form association with the truffles we want really. You tend to find them in peripheral margins of other forests. The Doug look a good age- but it looks a wee bit brushy there at the moment.