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Yes because polygons have 3 or more sides.
There is no special name: they are polygons, as are shapes with 3 or 3 million sides.
There is no specific name for such shapes.
A trapezium or parallelogram. A pentagon can have a pair of parallel sides. Polygons with 6 or more sides can have two (or more) pairs of parallel sides.
A 16-gon. You only name polygons up to a dodecagon (12 sides), excluding the 11-gon. After that, they are named by their number of sides with the suffix "-gon". Ex: 16 sides: 16-gon.