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An irregular tessellation is a tesselation made of irregular shapes. Escher is famous for drawing these with animals in them.
Irregular shapes are all around. Most shapes are irregular.
Meteors
irregular galaxy
Meteors
Irregular 3-dimensional shapes.
There is no special name. The term irregular is not appropriate because a rhombus is irregular but it has equal sides.
boogers
Irregular galaxies have no discernible shape.
Regular shapes are both equilateral and equiangular. Irregular shapes may or may not be equilateral and equiangular.
boogers
All 7 sided shapes are called heptagons.