Leptolalax gracilis Sarawak Slender Litter Frog
Some other names for this species:
Graceful Litter Frog
Some authorities have now lumped Leptolalax in with Leptobrachella. My go-to Borneo references haven't done that yet, so I'm leaving them distinct for now.
Kubah National Park, Sarawak, MalaysiaJanuary 27, 2017
Sarawak Slender Litter Frog (Leptolalax gracilis) Sarawak Slender Litter Frog (Leptolalax gracilis)
This species has the same basic leaf-litter sit-and-wait behaviors as its relatives in the genus Leptobrachium, but is proportioned more like a typical frog. I presume this means they generally eat smaller prey than their huge-headed cousins.

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 18, 2018
Sarawak Slender Litter Frog (Leptolalax gracilis)
This one was no wimp, holding its fully alert posture rather than crouching down as I set up for a photo.
Gunung Gading National Park, Sarawak, MalaysiaFebruary 20, 2018
Sarawak Slender Litter Frog (Leptolalax gracilis) Sarawak Slender Litter Frog (Leptolalax gracilis)
The first one here looks rather wistful and forlorn. I'm sorry if you had a rough day, li'l frog!

The second one is doing the ol' crouch-down-and-pretend-you're-not-there routine.

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Printed references: