I don't know specifically if there's a name for it. But it is exceptionally common and quite easy to replicate.
Alternating colored round cap strokes of random/varying lengths, red used here so it is visible.
[See here for how to randomize the path lengths.]
Add fill shape, behind the strokes, which matches one of the colors....
Object > Expand
Pathfinder > Merge.
Delete the red objects.
These are the basic, quick steps. As with most things, refinement will always make the final appearance better.