These are very hard to spell but here you go:
17 faces: septadecahedron
18 faces: octadecahedron
19 faces: nonadecahedron
20 faces: icosahedron
21 faces: unicosahedron
22 faces: dicosahedron
29 faces: nonicosahedron
30 faces: tricontahedron
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No 3D shape with FLAT SIDES has exactly 3 faces. 4 is the minimum.
it is a strong inadiquate word that describes a 3d shape. A tetrahedron.
A cube is a 3D shape that has 6 faces of equal area.
Octahedron
An icosahedron