On geogram they are called "collections" because you can synch files/folders with books, games, videos (this is for the prepper world) but it isn't yet working specifically as a sneakernet.
This is the basic structure to permit sharing, searching and browsing files:
I haven't yet ported the collections to the most recent version of geogram but should arrive within a month or so. First solving the topics of bluetooth and radio networks until they are more solid.
GitHub
central/docs/collections/others/README.md at main · geograms/central
Central location for documentation and other data. Contribute to geograms/central development by creating an account on GitHub.