Based on what we have observed with our red eyed tree frogs (they are about half grown), they would probably not be adverse to eating or at least trying to eat smaller darts. Their basic feeding mechanism is to leap with mouth wide open and engulf the prey. Even as young froglets they took on pretty large prey for their size. They have no problem descending to the bottom of the viv and pouncing on whatever they find at substrate level.
Bill
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