We saw quite a few of these frogs sleeping on the rushes in the Okavango delta. They were highly variable in color pattern but I believe they were all H. marmoratus. - https://www.herpmapper.org/voucher/39155/full.jpg
Resting on a plant along the forest path
Approx. 2 cm in length.
Found on orchid cactus (epyphyllum) plant