No, MUMPS (or M) is a remote descendant of JOSS, an interactive language of the 1950s. JOSS has all sorts of variants (DEC's FOCAL language of the 1960s was a dialect), but I think MUMPS is the only living one. MUMPS code is mostly unreadable, as the commands can be, and often are, abbreviated to the first letter. As a result, it looks a lot like line noise.
Regardless of its many warts, Cobol cannot be accused of being unreadable. Verbose, yes.
MUMPS was originally developed in the 1960s for use on minicomputers that had maybe 64KB RAM. At the time it was a lot more important to keep code size small, hence the single letter commands. Readability wasn't a concern then but it sure looks like a mess today.
Imagine harder. It was an enormous improvement over assembly language. Not so much for the basic coding but for the portability and built-in persistent data structures. MUMPS has an excellent "NoSQL" database built in which is a pretty good fit for a lot of healthcare use cases.