Tree frogs have four digits on their limbs, so they either have 3 fingers and a non-opposable thumb, or four fingers depending on your poing of view. Either way, the pads at the ends of their fingers secrete a sticky substance which make it impractical to play at any tempo faster than say.....1/4 = 120bpm? Aquatic frogs, on the other hand, have a rudimentary fifth digit on their front limbs and a rudimentary sixth digit on their hind legs. So while thumb position for the average amphibian may be unlikely and uncomfortable (especially with webbed feet), evolution would suggest that its only a matter of time before aquatic frogs have sufficiently developed thier extra phlange to the point where they can play bottesini's Elegy.
Do you have contact information for the artist? I'd like to use that for a new web site design for myself.
Nah, a four fingered tree frog will eat more flies and procreate more in bar (their main staple- barflys). And their five fingered aquatic cousin will do better at the symphony. Much like slabs, cochroaches maybe an important part of the evolutionary ecosystem, but I still think they're ugly.