monticule
/ˈmän(t)əˌkyo͞ol
/noun
1A small hill.And so, she found shelter under a mossy nook nearby that protruded from a monticule of earth.
1.1A small mound caused by a volcanic eruption.The tourist spot is a monticule, or minor cone of a volcano.
Origin
Late 18th century: from French, from late Latin monticulus, diminutive of mons, mont- 'mountain'.