The name Follet is used primarily for the descendants of elves who lived in the once-bustling underground dolmen metropolises. As these elf cities lost their strength and power, the Follets moved away and came more and more under the influence of human beings. Perhaps because of their long association with humans, the Follets cannot be driven away by exorcisms or holy water but continue their pranks right under the nose of history. They are a merry, independent group and know no masters. The only thing they fear is steel, and a good strong knife often drives them away.
Humans who have the patience to withstand their high jinks and who do not give way to anger and retribution earn the respect of these Little People. As proof of their friendship, the Follets bring presents, complete unfinished work, and feed and pasture the animals. Their lore spans through the ages and most prominent in France. They do live in underground caves, sea or land caverns, and among dunes. Their dress is in multi-colored coats covered with tiny bells. Usually between one and two feet high, their animal form is a goat and their passage into homes is through the cat doors or chimneys.
images above from Brian Froud, myself, and W. F. Wiegard