For about a week after SoF was released, these skellies were always up in and around the ranch area, and they ALL dropped one of the Faende items EVERY TIME. The Faende's Earstud was the common drop, and the primary dropped about once every 5 kills. In addition to the two Faende items listed, they would also drop Faende's Diamond Earstud roughly once every 10th kill.
Needless to say, they nerfed it! The skellies have been moved near the HoS zone line, and now only the named skelly Debilitated Skeleton will drop the Faende items.

Aderirse Bur
Animating Force
Blue Diamond
Bone Chips
Curzon
Dweric Powder
Faceted Crystal
Fine Skeleton Bones
Harmonagate
Peridot
Prestidigitase
Putrid Skeleton Bones
Raw Amber Nihilite
Raw Crimson Nihilite
Raw Indigo Nihilite
Raw Shimmering Nihilite
Scale Ore
Silver-Plated Gizmatic Modulator
Spell: Eleventh-Hour
Staurolite
Sunshard Powder
Uncut Alexandrite
Uncut Amethyst
Uncut Black Sapphire
Uncut Combine Star
Uncut Demantoid
Uncut Goshenite
Uncut Jacinth
Uncut Morganite
Uncut Rubellite
Urticaceae