These figures are apparently leftovers from an art installation and have been put up on this building in Düsseldorf in the harbour area next to the Rhine river.  They are called “Flossis” which refers to their fins which in German are called “Flossen”.  I wish I’d been on the other side of the river, closer to the building for a better photo.  But they definitely qualify for Cee’s Oddball Challenge.

https://ceenphotography.com/cees-odd-ball-photo-challenge/