Where does “friscus” come from?

friscus (Medieval Latin) comes from Proto-Germanic friskaz, from Proto-Indo-European preysk- — fresh.

Ancestry of “friscus”, step by step

Step	Language	Word	Meaning
1	Proto-Germanic	friskaz	fresh; not salty, unsalted
2	Proto-Indo-European	preysk-	fresh

friscus — Etymology, Origin & Word History | Etymology Explorer