In general, any 10-sided polyhedron is called a decahedron. With 10 regular triangles for faces, you may have a pentagonal bipyramid.
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octahedron - a polyhedron with 8 faces
If you mean a decahedron then it is a polyhedron with 10 faces
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No. The numbers are not consistent with the requirements of the Euler characteristic.
A polygon (2-dimensional shape) with 10 sides is a decagon. A 3-dimensional polyhedron with 10 faces is a decahedron.