Meristogenys jerboa Western Torrent Frog
Some other names for this species:
Gunther’s Borneo Frog, Matang Torrent Frog
Kubah National Park, Sarawak, MalaysiaJanuary 27, 2017
Western Torrent Frog (Meristogenys jerboa) Western Torrent Frog (Meristogenys jerboa)
This powerful jumper and swimmer inhabits rocky streams in lowland and hillside forests of western Sarawak. These two were near Kubah's waterfall.

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.

Kubah National Park, Sarawak, MalaysiaFebruary 19, 2018
Western Torrent Frog (Meristogenys jerboa) Western Torrent Frog (Meristogenys jerboa)
I believe these two have enough dark coloration on the snout, tympanum, anterior flanks, etc. to mark them as Meristogenys jerboa rather than the lighter-colored Meristogenys penrissenensis.
Online references: