Frog sitting in a Sikkim garden pond

Frog sitting in a Sikkim garden - can you help us identify this species of Bufo, as it displays perfect camouflage on the mottled rock that it sits on?

Sikkim is a landlocked Indian state located in the Himalayan mountains. The state borders Nepal to the west, China's Tibet Autonomous Region to the north and east, and Bhutan to the southeast. The Indian state of West Bengal lies to the south.
With around 607,000 inhabitants as of 2011, Sikkim is the least populous state in India and the second-smallest state after Goa in total area, covering approximately 7,096 km2 (2,740 sq mi). Sikkim is nonetheless geographically diverse due to its location in the Himalayas; the climate ranges from subtropical to high alpine, and Kangchenjunga, the world's third-highest peak, is located on Sikkim's border with Nepal.[6] Sikkim is a popular tourist destination, owing to its culture, scenery and biodiversity. It also has the only open land border between India and China. Sikkim's capital and largest city is Gangtok.

Source: Wikipedia

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