Avoid feeding tomatoes, superworms and mealworms. These aren't the best foods. Defiantly avoid feeding tomatoes though...
Superworms are very fatty and way too big for a small beardie to digest properly and not have problems. Mealworms have a bit of fat, but the dangers with them are mostly the chitin which is very hard and young beardies have problems digesting them which in some cases causes impaction.
I'd limit the waxworms, these are very fatty foods although they can be given to young beardies because they are generally soft bodied treats.
Overall treats can be quite addictive for beardies and some will straight up refuse any food in favor of the treats.
It took 10 months for me to get two of my beardies off superworms.
This will explain all the types of foods you can feed, and can't feed (mostly according to age).
All life stages eat 10-20 bugs a feeding.
1-4 months 3x a day.
4-12 months 2x a day.
12-20 months once a day.
20+ months twice a week at the least, every other day at the most.
Staple feeders - Crickets, locusts, grasshoppers, silkworms, black soldier fly larvae, dubia roaches, turkish roaches, possibly earthworms.
Treat feeders - Waxworms, hornworms, superworms, mealworms, butterworms.
Wax worms - once a week, 4-5 max.
Hornworms - every other day to every two days, 4-6 max.
Mealworms - every other day to every two days, 5-10 max. Only for beardies above 6 months.
Superworms - once or twice a week, 3-4 max. Only for beardies above 12 months.
Butterworms - once or twice a week, 3-4 max.
Daily greens- Turnip/collard/mustard greens, endive, and kale if added to a mixture of the other staple greens mentioned.
Fruit once or twice a week - Banana, strawberries, blueberries, blackberries, red raspberries.
For more food items -
http://www.thebeardeddragon.org/bearded-dragon-nutrition-data.php#veg
http://www.beautifuldragons.com/Nutrition.html
At his age salad doesn't matter, the bugs are the thing that matters however.
However once he's near his sub-adult and adult life stages he should begin to eat a bit more salad.