3d geometry question

Factual Questions
1

What is the name for a 3 dimensional trapezoid? I’m specifically looking for the name for a 4-sided pyramid with the tip cut off, or (if it makes nore sense this way), a cube in which every side is the same, but the bottom facet is ‘stretched’ larger. Sort of a cowbell shape.

If more than one term applies, please give me all of them. It’s for a short story and I’ll pick whichever sounds best…

2

would this be described as a trapezoidal prism?

http://www.themathlab.com/geometry/section10b/drawnets/trpprsnet.htm

this seems to be a site about cardboard boxes, but this one is the shape I’m imagining, and they call it a trapezoidal prism

3

It’s a frustrum. The same term is used for the corresponding part of a cone.

4

frustum, not frustrum