Thank you so much, Terry, for your feedback re my mystery frog. As you say, Seth correctly identified this frog as A. fornasini. That's a pretty impressive knowlege of herpetology. As soon as I did some research on this frog, I realised that was what I had. And your input has confirmed this. They do indeed have a broad, dark brown vertical band terminating in a point between the eyes. I have a feeling I have got at least one sub adult, hence maybe the stripes are not fully dilineated, as you suggest.

I have now reserched the basic husbandry for these kind of frogs, so now I can ensure they get the right care.

Many thanks for your help in this.