The only way Smeagol ate his Dubias were in a little Feeding Container. Just a Critter keeper.
When I brought it near his cage he already got excited. I would open the door, he eagerly hopped on my hand (elevator) and off he went into the critter keeper, going after Dubia's. After the first 3 or 4 though, he would only be interested if they moved . And they didn't, they froze, LOL.