Try this. It's my bamboo skewer and reptomin method.

It's quite simple, it works with adult and baby reptomin, though I think in your case the baby reptomin would work better (it clumps a bit better).

Here I am taking 4 adult sticks and wetting them in tank water so they clump, I then stick the clump on the end of the bamboo skewer ***NOT THE SHARP END***. Reptomin will usually 'stick' to the flat end of the skewer quite easily. (The baby ones stick better)

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Okay now you have a nice clump o' reptomin on a stick. Now my frogs know what's up when I do this, they come to the surface. As you can see below my albino frog is pretty smart and the second I open the tank he's ready to pounce!!

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It was too fast to take a picture of but let's just say a half of a second after this picture the reptomin was in said frogs belly and he was a happy camper.

Since your frog is still learning about the magical bamboo feeding stick, you can dip it in the water, move it around near him. Make it seem like prey, movement attracts them, let him see it, move it around in front of him.. he will take a bite. After a few times of this he'll learn that bamboo stick + reptomin = food!

Worked for me, hopefully it it works for you. Let me know if this helps.