An example of a frustum of a hexagonal pyramid (a.k.a. hexagonal frustum) from Wikipedia:
Is there a quick way to build one, given the Region
of two $n$-sided polygon bases?
Solution comes from @J.M.'s ennui. Example:
pts1 = Append[0.] /@ N[CirclePoints[2, 6]]
pts2 = Append[3.5] /@ N[CirclePoints[{1, 0}, 1, 6]]
ConvexHullRegion[pts1~Join~pts2] // Region
ConvexHullMesh[]
on the points comprising the two faces. $\endgroup$ConvexHullRegion
solves my problem completely! $\endgroup$