No I haven't heard any croaking.. I have been looking out for months now but they both seem pretty silent.

I normally just let the crickets roam free, when I first had them I used to feed one by one, I'd put them on a table and let them chase the crickets, they preferred the whole Jurassic park thing! I have tried tong feeding, but neither ever look interested that way. :/ And it's difficult for me to get the frogs out much these days as I have 3 cats now, I only had the 1 before, and they are a handful!