Okay, not a hurry issue, I don't have any yet and it may be a long time before I get them but I can't find a complete list so here goes.

Feeders I know should work:
Fruit flies
Springtails
Pinhead crickets (me personal last choice)

Things I think might work:
Baby Dubia roaches
Baby dwarf white isopods
Confused flour beetle larva

I know how to gutt load some of them.
Fruit flies add carotene and vitamins to the media.
Roaches feed carotene rich foods.
Not sure on the isopods or confused flour beetle larva short of dusting them of course.

So does anyone have any suggestion for feeding Fire belly toadlets?