Nanorana mokokchungensis is a robust-bodied and relatively large frog, reaching in snout–vent length. The snout is rounded and flattened. The eyes are large. The supra-tympanicfold is glandular, while the tympanum itself is absent. The forearms are robust. The finger tips are swollen but not dilated into discs; no webbing is present. The tibia are long and robust. The toes are moderately webbed and have weakly swollen tips. The dorsumbears large, scatteredtubercles. Dorsalcolouration is uniformly grey, but the upper eyelids are yellowish-grey. The thighs have diffuse crossbands. The ventral parts are cream with greyish variegations. Males have a subgularvocal sac.