Hi ClaraBell
Thanks for doings your research before bring home a new frog :-)

Your Whites Tree Frog will need to have a main diet of crickets. The silent crickets are just wingless and will cause less hate and discontent in your home at night :-)
You need to have crickets that are no longer then the distance between the frogs eyes.
Your also going to need to dust the crickets every other day with a calcium supplement. your pet shop will have this.

You can occasionally provide a treat such as a mealworm (not a fan of unless you remove the head) and earthworms are a common item to give them. Some folks also feed their frogs a main diet of roaches and many of the food items can be mail ordered if your having trouble getting them.

Once your frog becomes large enough, a pinkie can be given occasionally also.