yes it is
Yes.
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
NO spelling
Yes.
Yes, it is.
Yes.
yes
no
yes it is
Yes.
the names of them are semiregular polyhedron