Pacman Vision (Can they see small bugs?)

[Thevacantface]

I would avoid the leeches and snails because they are major parasite vectors.
Ant are more likely to be an irritation than a viable food source. Ant eating species are usually very specialized creatures.
Beetles and mealworms have to hard of an exoskeleton to be a safe food source.
Red earthworms have a bad taste, which could put the frog off on all worms and Canadian nightcrawlers are an excellent food source you want your frog to willingly eat.
I know nothing about the water bugs, slugs may fall into the same issue as snails, mice should be a rare treat not a staple, and I personally think crickets smell bad and are a pain to raise.

[Lija]

You would be taking huge heath risks for your frog, potentially killing it if you are to feed most things on your list.

To add to what was said already. Small insects like ants pac won't consider food.

Have nightcrawlers and roaches, 1 mouse no more then once a month and you will be just fine

[Lija]

Cleaned the threads a bit

[DVirginiana]

There are no 'micronutrients' that would be present in smaller feeders that aren't present in larger ones as well. That has to do with what you use to gutload the feeders moreso than the species of feeder. Seconding what everyone else has said about sticking to roaches, crickets, and the occasional pinkie mouse. The fascination with them isn't because they're big, it's because they are nutritious and the appropriate size for a pac.

Also, leeches produce a strong anticoagulant called hirundin that is actually used as a blood thinner in humans. I think it could cause serious issues if ingested in any large quantity by something as small as a frog.