Thanks. I did a little more digging and found a TEXT file inside the "Lego" icon.
The developer info was in there. Fortunately, I have only one application by that developer, so I was able to trace it back to a recent upgrade of that software.
By the looks of things (now), the "Lego" was something leftover when the newer version automatically trashed the older version during the upgrade. I moved it to the trash. Then checked to see that the new application still functions as expected. It does.