There was this one on F-Droid called Alovoa with a mosaic parrot logo that I downloaded and tried out as a gag with my girlfriend. I didn't get that far, because it looked like there was basically nobody – to the point that the UI showing me "people in my area" (as a sort of bubble collage) had to resort to duplicating multiple faces multiple times each.

At which point I decided I'd seen enough before creating an account. Maybe it works; maybe it's nothing but catfishing. Beats me. Try it at your own risk.