Ohhhh Another tomato frog owner! Yay I also just recently brought home my first tomato, Pekoe, not to long ago.. I found this dusting schedule to be helpful myself: http://www.frogforum.net/food-feeder...schedules.html
Maybe this can help you until a more experienced member can give you more specific advise.. they will likely need more details though, like how old he is, his size from snout to vent, etc.

Anyways I hope this helped a bit and good luck with your tomato

- Dani