A trapezoid can be called a parallelogram when it has more than one pair of parallel sides.

Is a trapezoid a parallelogram sometimes or always?

A trapezoid will have exactly one pair of parallel sides. Quadrilaterals will have four congruent sides. A trapezoid is a parallelogram.

Are trapezoids parallelograms yes or no?

A trapezoid has one pair of parallel sides and a parallelogram has two pairs of parallel sides. So a parallelogram is also a trapezoid.