Blue coloring behind the front and back legs suggests Giant. There is no evidence of a cross between species or whether it can even be done so it may appear not to be a Giant in appearance, but we shall see. Not a lot is known of the Tanzanian Pyxi or even the Pyxicephalus angusticeps so we may not be able to accuratly establish species here.

One thing is for sure. The blue is an accurate way to tell a Giant because the dwaf species lack this coloring. So far the Tanzanian species we've been seeing here lately do not have this blue coloring so unless its a cross between the two I'm going to stick with Giant.