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There are an infinite number of them. Among them are all
of the rhombic and rectangular prisms and parallelepipeds.
Yes, it certainly is!
According to Euler none; for all 3d shapes: Vertices + Faces = Edges + 2 ⇒ 12 + 8 = 19 + 2 ⇒ 20 = 21 So unless 20 does equal 21, no 3d shape has 8 faces, 19 edges and 12 vertices. Any 3d shape with 8 faces would be an octahedron.
A pyramid
Hexagonal prism
Not too sure but you may be thinking of a cube which has 6 same flat faces, 12 edges and 8 vertices