tetrahedron
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A pyramid - it has a square base, and four triangles meeting to a point at the top.
A four faced figure is a tetrahedron. If they are all congruent triangles, they are all equilateral triangles and it is a regular tetrahedron - one of the 5 Platonic Solids.
No.
Here is one way: /\ --- /\/\ ----- These are {45°, 45°, 90°} triangles. There are 3 on the bottom row, and 1 on top. Actually, any four identical isosceles triangles would work.
A triangular pyramid has four faces, and is referred to as a tetrahedron if the faces ale all equilateral triangles.