Someone put OpenMultiMaps on the Play Store renamed to "OSM - Open Source Maps & GPS"
When it's installed, it does show up as "Open Maps", but with the icon changed to the one shown on the Play Store.
https://play.google.com/store/apps/details?id=app.immaginetdev.openmaps
The "about the app" seems unchanged, at least, which is how I found this repo.