the t-rex diet is the same thing as the repashy superfood. they just recently repackaged it and that's what the label says now.

you can freeze it--i did this for a while and it worked fairly well.
Quote Originally Posted by Anthony Caponetto
Useful Idea: Frozen Dinner for your Crested Geckos
Pour your pre-mixed Crested Gecko Diet into these soufflé cups and set them on a tray in the freezer. Once the diet is frozen, place the cups into a zip-loc freezer bag for storage. When frozen in a sealed bag, the diet should last for at least a month.

Be sure the diet is thawed before giving it to your geckos. I've seen a gecko get a "brain freeze" from extremely cold food...it was one of the funniest things I've ever seen happen with my geckos, but I don't think the gecko appreciated it. :-)
see more details about the diet here: http://www.acreptiles.com/supplies_CGD.htm

if you do freeze any sort of mix you make, i'd not recommend adding citric acid to it because cresteds can't handle much citric acid, which is the reason citrus fruits are not good for them.