Uhmmm.... I don't know... if the frogs see it moving they might go for it. They can be fast when they want to. It sounds like a bad idea to me, shrimps are just perfect sized snacks for an ADF, and if they get within range, they'll get snapped up.
I guess you just have to know your frogs. I have one frog that goes for moving things and one that's really slow but expert at finding pellets.
Robert Falcon Scott - Red salamander HM plakat
Passed on- Friedrich "Freedy"
Four African Dwarf Frogs - Dorkus, Sporkus, Baron(ess), and Bubbles!