Several large Limnonectes species look pretty similar, and I am not expert enough to identify them confidently. L. ibanorum is my best guess here, but I wouldn't be surprised if this frog turned out to be L. paramacrodon instead, for example.

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.