That's great that he's eating!! YAYYY!! Don't know where you live but here in PA, the insects have emerged outside so they are pretty easy to find. However, since I started raising toads, I learned how to breed mealies, crickets, roly polys & red runner roaches. Between those and some waxworms that I purchase from my local bait shop... they have a nice variety. I also occasionally collect small slugs from outside and offer those too. As far as overwintering them... I have a 30 gallon tank in my home with lots of substrate and a few accessories that they hide/burrow under, and a water dish for them to soak in. I use a UVB light and supplemental powder to dust the feeders. They never went into a deep hibernation, only slowed down a bit with their activity and eating but now that the temps are warming and the daylight hours are increasing, they are becoming more active. I also have a feeding dish in their tank with waxworms, & mealies that they have learned to eat from. If you looking for other food alternatives... I'm sure you should be able to find some roly polys, millipedes & grubs if you live in a rural area? Check under leaf piles, logs, large rocks, etc... Sorry for rambling on, you may already know all this! Anyway, so glad the new guy is doing well!