A triangular pyramid.
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If the triangles are congruent then it is a triangular-based prism.
No, a dodecahedron is a 3-dimensional shape. Some of the 6.4 million topologically distinct dodecahedra have only triangulat faces, there are many more in which some faces, but not all, are triangular.
A triangular prism (Two triangles as the two bases)
a triangular prism
a triangular prism