Too much D3 vit can damaged their digestive systems, especially the kidneys.
But, D3 vit is necessary to help in fixing calcium on bones.

D3 can be brought by UVB also...But usually, we don't give UVB's to our frogs in terrariums.

So, what I do, is that I dust with only calcium 1 insect per week and I dust with calcium + vit D3 1 to 2 insects per month.

Could you post some pictures of your frog ?