It cannot be 'Raj give me the mangoes' because it would need the imperative form. In its current form it is not an order, just an observation.
'देता है' is the present tense. It would need to be in the imperative form to signify 'Raj, give me the mango' would be something like this, which we haven't come across yet.: "राज मुझे आम दे दो।" (informal) "राज मुझे आम दे दीजिए।" (formal)