dodecahedron
A face.
There is no specific name nor a specific shape for such a polygon.
Heptahedron.
A Platonic solid?
There is not enough information to determine how many faces the polyhedron has (and therefore its name).
dodecahedron
A face.
A face.
There is no specific name nor a specific shape for such a polygon.
rectangular prism
Heptahedron.
A Platonic solid?
the names of them are semiregular polyhedron
Tetrahedron
A polyhedron with 5 faces could be called a pentahedron, but a more common name would be a quadrilateral pyramid. A square pyramid is a special case of such a shape.
No, they are the faces of the polyhedron.