Hey, no problem.
Compost is really just a term for decaying plant matter. Leaf compost is decaying leaves. You can literally just walk under an oak tree and scoop up a bunch of the leaf compost beneath. The stuff that is partially broken down on the lowermost layer is great for holding moisture and attracting little insects for the turtles. It is believed that baby box turtles live in this layer between the decaying matter and the soil for most of their young lives.
Sphagnum moss is sold at any garden center and even at Walmart. I have found some inexpensive long fiber moss for sale in the orchid section of "Lowe's Home Improvement Center". It comes in a little square bale. It looks like just long pieces of green/tan moss. It is great for holding moisture and maintaining a bit of acidity(which helps fight off harmful bacteria and fungi). Just ask for sphagnum moss. They may take you to the sphagnum peat that is sold in large bales in the outside garden center. While this is good for adding to the soil, it is not good for a moisture holding top dressing.
Organic matter addded to the soil helps the soil hold moisture. Organic matter can be leaves, peat, grass clippings, wood chips, etc.. Ideally, it should be a combination of different types. You have some very nice, rich soil based on your photos. But, it looks like it would dry out quickly. Your spraying may not be enough. Adding the organic matter into the soil will help.
I can only see some early signs of growth abnormalities clearly on a few of the babies. Growth should be very rounded and smooth. Some shells appear rough. There is one hatchling facing away from the camera in the dead center of the photo...I can see how each scute is flattened, and meets the next scute at an angle, rather than a smooth, round transition. I've seen this type of growth in other hatchlings kept too dry. It isn't quite the pyramiding associated with dietary problems, but it still isn't ideal. Increasing the moisture by using material that naturally holds moisture well will do wonders for correcting any moisture-related growth issues.
I hope this is helpful. They all have significant growth on them, and that is a great achievement.