This is perfectly normal Pacman behavior, especially since this is a new environment. With more time, he may even dig a hole to hide himself in. Him not wanting to eat right away is also typical, he is stressed from all the change. Frog Forum has a great care article which can be read here.

As for temperature, you should buy a thermometer to put into the tank so you can keep track of it. A hygrometer is also a good idea so you know how humid it is as higher humidity is better.