Gutloading helps, like better quality food is generally superior to lower quality food, but I'd still suggest dusting every other meal with a calcium+d3 supplement or multivitamin that contains useable vitamin A. Herptivite multivitamin contains vitamin A, but it is good for reptiles that eat plants and can process carotene (the source of the vitamin A), but toads and frogs just can't do that all that well, so I'd suggest Repashy Supervite. It's a bit pricey compared to the Herptivite, but it's going to last you all year or until it expires. It contains a vitamin A that is useful to toads, along with a general multivitamin and calcium supplement. You don't want to overdue it, though, since vitamin A is toxic in large, consistent doses.
My feeding schedule for my little goons is Calcium+D3 on Monday, nothing on Wednesday, then SuperVite on Friday. The next week, though, I just do Calcium+D3 on Monday and Friday. Then repeat the first week. It gets them a good boost of vitamins two or three times a month while maintaining their bones and not putting them at any sort of risk of overusing the vitamins. Combo that with your gut loaded crickets and your toads should be quite good.
[repashy supervite](www.amazon.com/dp/B00BY9GRFS/ref=cm_sw_r_cp_api_glt_i_XBFQ0QAHX419JKTNKXDJ) Is this if?!