Looks like a
Hyla cinerea to me. If it's not eating the crickets right away, you might try the
http://www.frogforum.net/vivarium-te...owl-trick.html so they aren't able to climb all over the frog.
I may have missed it, but how big are the crickets you're feeding and how big is the frog?
The tank is also on the small side if it's an adult, bigger is better especially in the upwards direction. They like to climb and sit up high, you're unlikely to find it hiding in the rock if the rock is near the ground.
It may take time to settle in, it's good advice to move it to a quiet spot

. Good luck!