Looks like the shell is deforming and pyramiding. Most likely causes are:
Lack of moisture. Baby and juvenile tortoises require lots of humidity for healthy shell growth. Make sure you're doing daily soaks for 30 minutes.
Lack of vitamins and/or calcium. This is what I use for my baby Sulcata. I sprinkle about a teaspoons worth every few days onto his Mazuri and he eats it up.
My Leopard got really hung up on zucchini for a while; I started growing a couple types of grass and clover indoors, bought a couple hibiscus plants (with active flower blooms) and started picking two new things every week from the produce section till everything grew in. I added several live plants to his enclosure and researched what he'd find from his locale in the wild.
The dandelion leaf at the store is not the same type as grows in my yard and his preference for the outside version was a learning curve for me longer than I care to admit. 🙄
I found that pansies with greens, in a variety of colors, tempted him well enough. Summer squash helped transition him from zucchini to something of similar texture but a different color...from there I kept trying to shift colors to see what worked. Mixed up textures, but really pushed the grasses and clovers of differet size, shape and color shade. Wrote down for a few weeks what he sampled, what he ate most of, what wasn't touched and started limiting his zucchini more and more.
Repashy sells a powdered supplement that I found he fancied (it smells really good too), so adding that to new items encouraged him:
https://www.amazon.com/Repashy-SuperVeggie-All-Sizes-JAR/dp/B00CFK4ZP4
Hope any of this helps. It really seemed to be a print-a-list-of-everything-that's-safe and steadily working my way through it. I took the list to a bunch of local greenhouses to see what plants I could snag, ordered a bunch of seeds from online and really watched him outside to see what caught his attention the most. Keep us posted!