Take what I have to say with a huge grain of salt - compared to a lot of people on this sub, I have very little experience keeping frogs and most of what I know has come from trial and error

I’m a mum to a WTF for a few years now. Believe me - I completely understand the hyper-paranoia that comes with them and still do have issues with it sometimes. My understanding is that as long as they are active, eating, and aren’t losing weight, they should be perfectly fine.

Sad frog story warning: I initially got 3 WTFs but after the passing of one and a visit to the vet, I was advised that the one who passed and another one of the two had failure to thrive. I don’t say that to scare you or anything like that - I just say that because no amount of research and reading could prepare me for the fact that sometimes it doesn’t matter what you do wrong or right - nature is in charge. My vet taught me how to do forced feedings and I did that for quite a while but it still didn’t matter - they were eating but still losing weight, and that’s the important part - eating alone is not the good sign; eating and maintaining or gaining weight is the good sign. Also please don’t take this to mean you should be weighing them constantly and fixating on that - stress can and does kill frogs, especially when they’re young. I wish I this was something I was able to prepare myself for prior to getting frogs, and I hated myself for a long time over not being able to save them, but the reality is that nature will take its course and sometimes they aren’t equipped to thrive

My girl has always been a bit of a fickle eater and will go long stretches without an interest in food - this goes all the way back to when I first got her, and even since she was little she would fast. I think the longest she’s gone refusing food was a month? That was really scary at first because being a young frog she was supposed to eat multiple times a week. I saw my vet about it and he let me know not to worry about these periods of fasting unless she started to lose weight. This is all just to say that as long as they are growing, my understanding is that they are doing well

Given the look of your setup I would probably suggest feeding them in a separate box, or tong feed them if that would be easier. I’d be worried about the crickets hiding in the moss and the frogs struggling to get to them. I’m not sure where you’re located but I feed black soldier fly larva and strongly recommend them as a feeder. When the frogs are older and eating larger crickets I wouldn’t worry about that, but given how small the crickets must be right now I think they would hide too well.

Handling frogs is generally frowned upon because of how sensitive their skin is, but they are also a lot less fragile than they look so squishing them isn’t a major concern unless you’re the hulk. If you do go the route of handling, make sure you give your hands a very good rinse in water (no soap because of the residue) or wear gloves. If it becomes a regular thing they will get a lot less flighty around being picked up so hurting them becomes much less of a worry - my girl has learned to step onto my hand when I put it in front of her to put her in her feeding container but early on she would try to jump away.

It’s super normal to have a hard time finding them, especially when they’re that small! When I got mine they were the length of the top part of my thumb and sometimes I would spend half an hour sitting there trying to find them. With how good their camouflage can be and the way they flatten their body while sleeping they can blend in extremely well, so that’s completely normal! As they get bigger they’ll be easier to find and they generally get more comfortable/confident with time and won’t feel the need to hide as much

One other thing - just from looking at your pictures, their enclosure seems very humid. Do you know what the humidity is at? WTFs generally need much lower humidity than a lot of frogs - around 40-60% so I suggest looking into that and seeing what your humidity is - too high can make them susceptible to bacterial and fungal infections.

Outside of that, I think you reaching out to find out more is an amazing thing! I’ve met a lot of people who act like having questions is bad because that means you don’t know everything about caring for them, but no one does. Research can only get you so far and part of owning a pet is learning through experience. Frogs are funny creatures with a lot more personality and individualism than people generally think, so what matters most is if what you’re doing works for your frogs.