If those are all the faces then it is a 26-hedron. There is a Greek prefix for 26 but unless you want to be pretentious and unhelpful, I would not bother with the prefix.
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They are called polygons
Regular tessellations can be made using triangles, squares, and hexagons.
a geometric shape made up of 20 triangles. :)
It doesn't exist. The least number of sides for a 3-D shape only made of triangles is 4.
An octagonal pyramid has eight triangles on an octagonal base. An octahedron can also be made by putting a square pyramid on another inverted square pyramid. This shape has just eight triangles and no others.