Toads are frogs. In the case of the Panamanian Golden Frog, it's actually a toad because it's a member of the "True Toad" family, Bufonidae. Members of that family have ~dry skin and a generally similar body plan, giving them that "toad" look. Where things start to get dodgy (and where your query is most applicable) is with frogs like the Oriental Fire-Bellied Toad. These are in a different family altogether but they get called toads because of their very warty skin and their hopping approach to movement, rather than jumping. Still confusing though, isn't it?