They do not have specific names. They are triangles and, if one of them happens to be horizontal and lower than the rest, it is called the base.
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A tetrahedron is a four sided polyhedron. Each face is a triangle. If it is a regular tetrahedron, then each face is an equilateral triangle.
Each face has three edges.
They don't have names beyond "the faces of the tetrahedron."
A tetrahedron must be plane faced and so, it is just an ordinary tetrahedron.
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