I'm sure the frozen fruit idea would work.But Ild suggest it more for a treat than a diet. Here is why. I decided I wanted to raise and breed cresties .. I went the fruit/babyfood/ Crested gecko diet/and occasional crickets route.
As do most new owners it didnt seem they ate the crested gecko diet fast enough for my liking ..so I gave more and more babyfood and or fruit in the mix. 10 months later my cresteds were all doing well and appear healthy .Adult females were laying healty and fertle eggs ..ect.BUT all of my juvies were small for thier age.
I have since began mixing just the diet per directions. And it turns out they eat it just fine ..they all began a growth spurt ..Simply put I think the more you dilute the crested gecko diet with babyfood the more you miss out on essential ingrediants they need for proper growth. Crickets on the other hand speed growth even faster probally due to the additional protien .
I dont want to start the crested gecko diet debate again..suffice it to say its better than babyfood.