No, you cannot.
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By themselves, only 3: triangle, square and hexagon. But there are combinations: eg octagon + square.
No
Yes. Can it tesselate R^3? Only if its base pentagon is non-regular.
An 8 sided octagon can be either regular or irregular in shape.
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.