what do you call a parallelogram with four right angles

A paralellogram with 4 right angles is a rectangle.

A judge without any thumbs - mmm - Justice Fingers ?

A parallelogram has four sides, therefore, it cannot be a triangle.

If a parallelogram has four right angles, then it is a rectangle. If it also has four congruent sides, then it is a square (which is a special type of rectangle).

What do you call a parallelogram with four right angles ......sounds like the start of a joke.

Here's another one,

What do you call a Judge without any thumbs ?