From ShaveWiki
Fougère is a classification of fragrances, meaning fern in French. It was coined by Paul Parquet, the chief perfumer for Houbigant in 1882 when he blended oakmoss and lavender. While it doesn't smell anything like ferns (ferns typically exhibit no odor whatsoever), it reminded the perfumer of the woods, so the name stuck.
In the fragrance wheel created by perfumer Michael Edwards to categorize modern scents, fougère is placed at the center, as it contains essences and elements from the woody, floral, oriental, and fresh groups.
Great examples of fougère based colognes are Truefitt & Hill's "Freshman" and Creed's "Green Irish Tweed."
