Occidozyga baluensis
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Seep Frog

These frogs are almost always found in or around shallow pools into which water is seeping from a nearby slope. So specific! Unfortunately I don't remember if that was the case for this one, the only individual I saw.
Online references:
- Occidozyga baluensis account on AmphibiaWeb
- Occidozyga baluensis account on Frogs of Borneo
Printed references:
- Inger, R. F., Stuebing, R. B., Grafe, T. U., Dehling, J. M. 2017. A Field Guide to the Frogs of Borneo, Third Edition
- Malkmus, R., Manthey, U. Vogel, G., Hoffmann, P., & Kosuch, J. 2002. Amphibians & Reptiles of Mount Kinabalu (North Borneo)