feeding a baby froglet?

[greengarden]

I have a little dilemma, I have here what are often called 'banana box frogs' in Australia as they hitch rides in boxes of banabas from up north but I think it came off one of the bags of grain I buy for my birds/poultry. I can't just let it go in the wild here as there are laws against moving frogs due to a fungal infection that has decimated populations. As well as that I believe it's a tropical species so would die here. I am happy to just put it in a little tank for now(even though I am not really supposed to do that either) and then when I have my indoor courtyard which will be warmer it can live in there and essentially be wild but in a fairly contained situation if that makes sense.

Thing is it's tiny. not even half an inch long yet and I'm not exactly sure what I can easily feed it. I grow meal worms for my lizards, if I was to dig and find the really tiny ones would they be ok? Any other reccs? Once my terrarium is set up for my orchids I thought I might just pop him in there until he can go free.