They are a tawny colored small frog with black spots. They have the build of any common frog.
They how and swim around the tank, they can have any tank bottom, gravel or glass. They will eat a variety of things like bloodworms or glass worms, they make good company for the Betta Fish.
A basic rule of the thumb is one inch of frog is one gallon of tank.
Many insects will do, the food has to be in front of their face to eat it though.