On my waterfall hike the other day I photographed a frog that was new to me. Lisa here at the lodge helped identify it at a Brilliant Forest Frog or Lithobates warszewitschii which is among the 194 species of frogs here in Costa Rica. The link to frog name is to Wikipedia but more research has info on: (1) IUCN Red List, (2) Amphibiaweb, (3) CRBio, and many more!
The first photo below is of the back of the frog made on my cell phone and the other, a side view, with my Canon. To avoid scaring him away, both had to be shot from a distance in little forest light,f thus had to be cropped a lot, so not very good shots, but you can see what he basically looks like and online you will see some varieties of colors, etc.
See also my Costa Rica Amphibians Photo Gallery for more than 20 species I have photograph and about that many more unidentified! 🙂
¡Pura Vida!