A goblin is a diminutive, grotesque, and often malevolent humanoid creature prominent in European folklore, typically characterized by its mischievous or demonic nature, small stature, furry or leathe
The Princess and the Goblin by George MacDonald, illustrated by Jessie Willcox Smith, 1920
Kobold is a generic name for a household spirit in German folklore.
Goblin
…Latin gobelinus or Greek kobalos (meaning rogue or sprite), though some scholars trace it to earlier domestic protector spirits like the Germanic kobold, which were later demonized under Christian influence. Similar creatures include brownies, dwarves, duendes, gnomes, imps, leprechauns, and kobolds…
The kobold of Hildesheim―Illustrated by William A. McCullough, Nymphs, Nixies and Naiads (1895)
Household spirit, kobold, or gütgen―engraving by Thomas Cross, Sr. (fl. 1632–1682), frontispiece to Praetorius (1668) [1666] Anthropodemus Plutonicus.
Plant-people, Alraun (mandrake) ―engraving by Thomas Cross, Sr. (fl. 1632-1682), frontispiece to Praetorius (1668) [1666] Anthropodemus Plutonicus.
Hinzelmann was a kobold who haunted Hudemühlen Castle.―Willy Pogány illustr. (1912), "The Little White Feather" in The Fairies and the Christmas Child ed. Gask