Tetrahedron Vertex Truncation
Tetrahedron Vertex Truncation becomes
Tetrahedron Edge Truncation
Tetrahedron Edge Truncation transforms it into cuboctahedron and then ends up as its own dual, tetrahedron again.
Tetrahedron Snub Truncation
Tetrahedron Snub Truncation morph into
Tetrahedron and Cube Relation
Tetrahedron can be changed into a cube by triangulate each face and extend it outward.
cuboctahedron and its dual the rhombic dodecahedron (in wireframe)
vertex truncated tetrahedron and its dual (in wireframe)
tetrahedron as stoneball