quadrangle
A quadrilateral.
Quadrilateral
Get any 4 sided shape and vary all the sides to different lenghts and make it look weird-there you go an irregular 4 sided shape.
Tetrahedron
square
square
a square
sqare
There is no specific name for such a shape.
It is a quadrilateral with no special name.
a 4 sided shape is called a quadrilateral