Yes, bearded dragons can eat bananas, but you should only feed it to your beardie once or twice a month. I wouldn’t give it to my dragon more often than that because it can make dragons sick.
Bananas are high in phosphorus which binds with calcium and could cause Metabolic Bone disease. If you are feeding too much phosphorus, your beardie can become calcium deficient that will weaken the bones and cause Metabolic Bone disease.
Bananas, Raw 100gm
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There are a number of foods that you can safely give to your bearded dragon. Here is a complete list of food for bearded dragons