A square pyramid.
If you would like to be abstruse you could call it the first Johnson solid (a non-uniform convex polyhedron).
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A square based pyramid is the best name. It is a pentahedron, but that could also refer to a pyramid on any quadrilateral base and so the name is far less informative.
It is just called a square pyramid, but its not square. Its only square on the bottom, so they call it a square pyramid, or you can simply just call it a pyramid because a pyramid is a pyramid.
sqare based pyramid
Another name for 12x12 is the product of 12 and 12, which equals 144. In mathematical terms, this is known as the square of 12, or 12 squared. The square of a number is the result of multiplying the number by itself.
pentagonal pyramid