Nyctibatrachus

Nyctibatrachus is a genus of frogs endemic to the Western Ghats of southwestern India. Their common name is night frogs. Their scientific name also means "night frog". 

These frogs are quite common, and researchers think this has been overlooked because of their small size.Briggs, Helen 2017. Meet the frog that can sit on a thumbnail. BBC News Science & Environment.  They are indeed extremely small, and can sit on a coin or a fingernail. However, they are not so small as Paedophryne, which is the smallest land vertebrate.

 References 

Category:Frogs of Asia