This species was only split out from the Limnonectes “kuhlii” complex in 2017. The adult males are known for their particularly large heads, and there are some other details (such as an indiscernible tympanum) that distinguish this species from others in the complex. Unfortunately, the paper that described this species did not explain the origin of the name “kong”.

My Travelogues and Trip Lists page includes a complete list of the herps I saw in the wild on this trip to Malaysia, as well as a travelogue of the trip.

Yep, that's one big head all right.

I'm not completely sure that this extremely big-headed frog isn't Limnonectes conspicillatus instead. That species also has the big head on adult males. But I see no sign of tympanum here, so I'm calling that "indiscernible".