There are over 2,400 species of land vertebrates (excluding fish) in India, and around 218 species of frog, but a newly discovered species, Nyctibatrachus minimus, is believed to be the smallest of them all at only 10 millimetres long.
A new nightfrog, Nyctibatrachus minimus sp. nov. (Anura: Nyctibatrachidae): The smallest frog from India. Current Science 93, 25 September 2007, 854
(very slow, but it will download eventually)