Tomato frogs always look plump when they are healthy and that is just their nature.

I would feed as you have been but change to every other day and not daily to see how the frog's weight is maintained. Are you dusting the crickets? Calcium is very important and needs to be part of every frogs diet.

Photos are always welcome and other Tomato Frog keepers may chime in as to how their frogs compare to your in size and weight.