Is this a polygon or trapezoid?

Answer: No
The reason why is because this is actually a pentagon since it has 5 sides. A trapezoid must have 4 sides (making it a quadrilateral), and exactly one pair of opposite sides are parallel. The other pair of opposite sides are not parallel.
Answer:
polygon
Step-by-step explanation:
A polygon describes any shape, a trapazoid describes a specific shape with 2 parallel sides and 2 non-parallel sides (like the image below)
as we see your image does not look like the image below, so it would just be a normal old polygon
hope this helps!