"Fern Gully," animated movie
Fern Walters, character from TV's "Arthur"
Fern Arable, character from book/film "Charlotte's Web"
Fern, the GreenFairy from the "Rainbow Fairies" book series
Fern Test - Laboratory test usually used to determine if there has been an amniotic fluid membrane rupture during pregnancy, if positive a very pretty 'fern' crystallization pattern appears on a microscope slide (http://en.wikipedia.org/wiki/Fern_test)
Fern, character from episode of "Sex and The City"