That will seriously malnourish your dragon. How much and what they eat depends on how old your dragon is. Here's an excerpt from my Care Sheet I made for spreading good info for Bearded Dragons :) Live Prey. Silkworms (Best), Phoenix Worms, Crickets (Gut Load and Dust) or Roaches (Dubia or Lobster to name two).
Namibia boasts the largest free-roaming population of black rhino in Africa, and the largest cheetah population in the world. Namibia is also home to a unique population of elephants that have adapted to the arid climate.
This area is covered by sand of different thickness. There are many types of vegetation in Namibia. The three main vegetation regions are the savannah, which covers about 64% of Namibias land surface; the desert vegetation covers 16% and the dry woodlands cover 20% of the land. Vegetation types are shown in the following map: Savannahs: