I wouldn’t worry about overfeeding a toadlet this size. One or two 1/4 inch crickets a day is fine. I’d avoid mealworms though as the chitin level is high in comparison to other feeders. A good supplemental feeder is black soldier fly larvae. They are often sold as Phoenix worms in pet stores. Also rather than buying crickets every day your best bet would be to purchase a dozen once a week, keep them in an escape proof container like a kritter keeper and gutload them before feeding. By gutload I mean feed your crickets carrots, organic dandelion greens, potato or a commercial feeder diet before offering them to your toad. They will be more nutritious for your toad this way. You may also choose to supplement by dusting your crickets with something like repashy supercal once a week or so. Good luck.