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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.
Dragon is the answer
An 8 sided octagon can be either regular or irregular in shape.
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).
A regular octagon has 8 sides similarly to an octagon. The name regular octagon means that all angles are the same, therefore inferring that all sides are of equal length.