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That's called a Decagon.
12 faces, 30 edges and 20 vertices. It has 2 decagons plus 10 rectangles between them giving 12 faces It has 2 x 10 vertices on each decagon giving 20 vertices It has 10 edges round each decagon plus another 10 joining the vertices of one decagon to the other decagon's vertices giving 2x10+10 = 30 vertices
In 2-d, the naming of polygons is such that a 10 sided shape is a decagon. Even if it is a 5-pointed star shape, it is a decagon. A concave decagon (rather than convex) but still a decagon. In 3-d, a decahedron, possibly, with the term "sides" being used for "faces".
Not sure what a decagonal is. Since the question refers to faces, edges and vertices, it may be assumed that the object in question is 3-dimensional. A decagon certainly is not, so decagonal cannot be a mistaken name for a decagon.
Decagon