the.com/frond

the fern's flag, unrolling itself like a slow green fist opening

means A frond is the large, often feathery leaf of a fern or palm, typically divided into many smaller leaflets.

from From Latin 'frons' (genitive 'frondis'), meaning a leafy branch or foliage. The word stayed quiet in Latin's shadow until 18th-century botanists revived it, wanting a precise term for the distinctive leaves of ferns and palms rather than lumping them in with ordinary 'leaves.' So 'frond' is an old Roman word given a specialist's second life by science.

name: the curled young frond is called a fiddlehead
shape: unfurls in a spiral called circinate vernation
edible: some fiddleheads taste like asparagus, others poison you
family: palms and ferns both wear them
age: ferns waved fronds before dinosaurs existed

for instance

tree fern fronds — dicksonia antarctica grows fronds up to 4 meters long in australian rainforests

coconut palm fronds — cocos nucifera produces fronds 4-6 meters long used for thatching across tropical islands

bracken fern fronds — pteridium aquilinum covers 3% of earth's land surface with distinctive triangular fronds