Welcome aboard. Just curious, what exactly is a North American treefrog? We have several species native to this continent. Are they Hyla cinerea or Hyla versicolor or Hyla gratiosa? Green treefrogs, Hyla cinerea are green with have a white stripe on each side, but not always. Gray treefrogs, Hyla versicolor are generally gray with a pattern that resembles tree bark. They also have the ability to change color, from gray to green to white or to brown. Barking treefrogs, Hyla gratiosa are green like H. cinerea but have a textured skin and generally have brown spots on the back. Those are the three most common native species in the pet trade.