You're going through what I went through with my golden dwarf eel. Man I feel for you, there is nothing more frustrating than trying to entice something that's on hunger strike.
Apples to oranges, but for what it's worth, the first food I got my eel to eat was squid (from the fish store, little squares of the stuff that was way softer than the squid I had from the grocery store). After that he would eat oysters and mussels and other clam meat. Don't know how interested a frogfish would be but it's worth a shot. Scallops seems like a good suggestion too.
Good luck.
And Machete, sorry to hear about the blenny. That guy was a beaut!
