Pink/purple seems to exist in froggies. From a few years back: Scientists find 24 new species in Suriname - Technology & science - Science | NBC News

The colour in the one from Facebook may have had the saturation ramped up (and be a different species from the Atelopus above), but if you're viewing pictures likely taken without any regard to colour accuracy on a non-calibrated monitor in a web browser that doesn't recognize colour profiles and have an expectation that what you're looking at actually matches reality, raise your hand