I had the same problems with all frozen foods except bloodworms when I used to feed my frogs frozen food (mine are ACF though not ADF). I usually feed mine earthworms now, but they might be a bit big for ADFs. I haven't tried glass worms or plankton. I've tried beefheart though, and it wasn't really that messy, although my frogs wouldn't eat it. The chunks in the blocks I got are quite small but not so small that they were messy (maybe about half the size of a pea) and would probably be fine for adult ADFs. I've heard it's quite fatty though so it should only be fed occasionally as not very good for your frogs. How did your frogs get on with the plankton?