How old is your little baby & how big/long is he? You can post pictures so we can see him.
Are the crickets you are feeding, smaller than the space between the eyes?
You could try small dubia roaches, small silkworms, phoenix or calcium worms are all good choices.
Which greens have you tried? Many times, the babies & youngsters tend not to show a lot of interest in them initially but keep trying. Eventually he will recognize the greens as a food source!
Are you using a good UVB source & supplementation for him?
How are the temperatures in his tank for him?
When ours was small we would have to dangle & wiggle veggies in front of his face,and he would only eat a couple bites. I am surprised yours doesn't go for the crickets. Spike would attack his crickets. He went from 5 crickets a day(Pet Smart diet) to 15-20 twice a day. Now we've switched to small dubia roaches which he eats less of,but are more filling/more protein. Make sure your temps are correct as that will affect their appetite.
This usually works....put 3-4 crickets at a time in a jar with a lid and add a pinch of calcium powder. Shake the cricks hard enough to make them dizzy and drop them near the baby. Babies are often attracted to the weak, slow moving bugs + gobble them right up. If he eats the first ones you give him, offer more until he's done.