My 5 WTFs were also this small and we had the same problem at first. I fully agree with keeping them in a small vivarium at first can help them find their food (we put 2 or 3 each in 2- 10 gal. aquariums with screen lids for a month or 2. Also, we tried the glass bowl trick but it didn't work for me because one of the babies was 'piggy' and would jump into the bowl and eat ALL the crickets. Someone on this Forum suggested 'Spot Feeding' so, for awhile, I would remove my problem eaters one at a time from the tanks every evening and put them in a small Kricket Keeper (with the tube ports closed off) with a bunch of tiny crickets and watch to make sure they would eat a few, then switch frogs. I also put small crickets in the aquarium at night so that they could catch more if they were still hungry while also practicing their hunting skills. This seemed to do the trick as they are all hunting on their own now. They wouldn't always eat in the Kricket Keeper but it made me feel better to at least give them the chance. As for the cricket sizes, I got tired of going to the store that often, but I would buy just a few nights crickets at a time because they would grow so fast! Now we are breeding our own which works much better. Four of our babies doubled their size in just two months and we are getting ready to put them in the hugh (150 gallon vivarium this week). Sadly one died- no idea why. The fifth will have to stay in the small tank for awhile longer- he must be some sort of runt because he hasn't hardly changed size at all and I was worried he would die also. I have now witnessed him catching crickets in the aquarium so I am not spot feeding him anymore, just watching to make sure he doesn't start to look skinny again. Hope this helps!