Thanks everyone for your input. I sent the photos to Breda Zimkus of African amphibians lifedesk. I got a reply pretty quickly. She suggests its a Leptopelis sp.. likely a Bocagii or commonly called a Bocage's Tree Frog. As it was only about 2 cm and has a very green back I'm assuming, if it is a Bocage's, that it is a juvenile. Thanx again