I haven't tried freezing anything in rolled nuts - but I would be cautious of doing so. I think they will be affected by freezing. I am just now doing a freezing experiment with an exposed candied pecan. I am hoping the candying process protects it.
I suggest you do the same and try an experimental batch to see how the nuts are affected. For sure, you will have to pack them in closely so you have very little air in the package.
Again, thank you Lana for your invaluable advice. I think for the nut covered truffles, I will freeze the already rolled ganache pieces, then dip and cover with nuts when needed so as to keep the nuts intact as possible... as unlike your pecan pieces, they are not candied.