Quick assessment, might be wrong:
Between P. natalensis and P. bullans. And if I measured correctly the SVL, around 25, then its P. bullans.

Found - 26/11/18 at a small pool fringing the Karanga River. (the leaf litter place on the lower end)
Pictures taken 27/11 at Moshi House and the Pool.
Released 27/11 back to the original lcoation.

On 29/11 found eggs at the exact place where the frog was found and released.

Note: On 26/11 2 frogs were seen, one was the one that was caught, and the other was pushed down by the water into a pool immediately below the original pool. Both were same species probably.
On 28/11 the last observation of the frogs was made in the original place. 1 individual, probably the one that was released the previous day.

Tadpoles have been seen in the pool, but on the other end to the adult frogs and eggs. 1 was caught 28/11. (Hyperolius)