Where to Find and Catch Froslass
From Pokemon Go Wiki
Froslass are found and captured in Nest and Habitat locations.
Nests
Froslass Nests are locations that consistently spawn Froslass.
Habitats
Froslass Habitats are spawn locations where Froslass is likely to be encountered, but not guaranteed the way a Nest is.
Additional Tips and Information
Best Nests
If you know a really good nest or any of the nests above is really good, list them here:
