To keep your toad happy & healthy they need to be able to burrow enough so they are completely covered. I give mine up to 5 inch in some places. You don't want the soil to wet, they are not tropical and will prefer areas of some what drier substrate, make it slightly moist but not soggy. Like Carols said Calcium w/D3 alternating with a multi vitamin are extremely important for babies so they can grow into strong healthy adults. But my 2 cents on how often to dust feeders is every other day and skipping on the weekend. Ex: Mon, Wed, Fri multi-vitamin, Tue, Thur calcium w/D3 as babies, once adults, over 1 year you can cut back on this. Canadian night crawlers work best, but if they're to big & you don't want to cut them up, small crickets and small roaches work
great also, and don't forget the pill bugs, mine love these and great source of calcium too. If these things are to much for you to keep up with, then I think you need to let the toad go back into the wild. If you choose to keep this one, you may be in for many long years of upkeep on this little one. Not only habitat & food expenses, also medical expenses if illness or injuries happened.
It's not JUST a wild toad, it's something to be cherished and respected.