You you are on the walking trail to see the gorillas, you do pass through the small shack of a building.  Most people stop and stare at the naked moles.  Don't get me wrong they are fascinating, but these guys are huge.  I do not know what kind of frogs they are, I will have to check next time.  There are two located in tanks next to each other.  Animals are truly amazing and we need to appreciate the smallest to the biggest .