Frogs... can eat ANY live insect.
I had pet tree frogs.... and, I would myself, go out and catch grasshoppers for it, once a week. And it would last all week or longer.
I kept any insects I caught, in a plastic jug.
They can also eat meal worms.
You want to give a varied diet.... you do not have to "only" give crickets.
You also do not have to, give $1 worth of crickets to the frog each day. That is one container everyday.
Usually, at our pet store locally... crickets are sold in containers of 20... for about $2.00.
Crickets are also easy to care for... you just keep them in a separate container, and put a little oatmeal in it and a sliced carrot (for moisture), and the crickets will last a LONG time. They will eat the oatmeal and the carrot. And of course, have holes poked in the cover of the container for air.
Again, you can catch any insect for the frog.... and at night too, by turning on a light to attracts bugs.
all the best,
Susan