An octagon is an eight-sided two-dimensional object. If each of the eight sides to an octagon were concave, it would still be an octagon. So, yes, it could.
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A concave octagon has is an 8-sdided figure in which one or more vertices (interior angles) are more than 180° , producing a shape with an inward bow, or a concavity (think of a cave).
The name of an 8-sided polygon is octagon
It is a concave octagon.
It could be a triangle, a quadrilateral, a pentagon, a hexagon or even an octagon if they are two concave quadrilaterals.
Dragon is the answer