A one-hundred sided polyhedron is called a hecatohedron, comming from the Greek Hecto- meaning one-hundred and -hedronmeaning a three-dimensional figure.
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A polyhedron with 20 faces is called an icosahedron.
Octohedron
I believe it called a Bucky Ball. After Buckminster Fuller.
A 2D seven sided figure is called a heptagon. A 3D seven faced polygon is called a heptahedron.
A shape in 2D with n sides is called an n-gon. In higher dimensions, a shape with n sides is called an n-sided polyhedron.