Kalophrynus eok has been described only in 2003. Very little is known of this species of which only the holotype is known.

The male on the images was calling in the morning hours from a phytothelm (internodium of a fallen bamboo) after heavy rainfall; suggesting that the species uses phytothelms for reproduction.

The species is among the smallest in the genus. The holotype measured only 26.3 mm snout-vent length. 

The only known place were this species has been seen is in the Bario Highlands at approximately 1.000 m asl.

it can secrete white, sticky slime when attacked by a predator.