By definition, a dodecahedron must have twelve faces. So it must be an decagonal prism.
Edges = 30
Faces = 12
Vertices = 20
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A regular dodecahedron has 20 vertices, 12 faces and 30 edges. A dodecahedron can also be a endacagon based pyramid which has 12 vertices, 12 faces and 22 edges, or A decagon based prism which has 20 vertices, 12 faces and 30 edges, or one of many other configurations.
A pentagonal prism has 7 faces, 10 vertices and 15 edges.
faces ,edges and vertices of a rectangular prism
An octagonal prism has: 10 faces 16 vertices and 24 edges :)
A triangular prism has 9 edges, 5 faces and 6 vertices