Put ice in the top one.. and put the bottom one in hot water. Top one pops right out!
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More like two tetrahedrons stuck together.
Octahedron https://en.wikipedia.org/wiki/Octahedron
Eight sided three-dimensional shape. Often this looks like two pyramids stuck together at their bases.
A hexahedron or a triangular dipyramid. This is the shape formed by two triangular pyramids (tetrahedrons) stuck together along one triangular face.
Put ice in the inside one and rub the out one. The ice will result in thermal contraction and the friction in thermal expansion. Neither will be large but should be sufficient.