Prince Charming

The one who took this photo just recently is a sister in Christ and a friend. I was at this country about 26 years ago and because my younger sister at home was studying  frogs during her premedical school years
I ended running after this thing with another close friend! My, that was hilarious and we never caught one.
In fact we nearly fell to the lake where these were mostly found!My question is can you tell how big this creature is?