It is still a polyhedron. It may or may not still be a prism.
Yes.
yes it is
the names of them are semiregular polyhedron
Yes
A triangular prism is a polyhedron. Polyhedra is a plural term.
yes
Yes, a trapezoidal prism is a polyhedron. A polyhedron is a solid three dimensional object with flat face, straight edges and sharp corners.
Yes, it is.
yes it is
Yes.
yes
Yes.
no
Yes.
NO spelling
Yes
the names of them are semiregular polyhedron