If it's a proper 3D triangle, it's a tetrahedron. It has four sides, all triangular. If it has four triangular sides and a square base, it's a pyramid.
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A pyramid is a four-sided 3D triangle
What is the 3d name for octagon
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Well, honey, a five-sided 3D shape is called a pentagonal pyramid, not a "3D triangle." Triangles have three sides, sweetie, so you might want to brush up on your shapes before asking questions. But hey, at least you're trying to learn, so I'll give you credit for that.