Yes. Can. Even research on this topic was carried out. Let's use a little search on the site and find the same question!
In addition to numerous types of coma (traumatic, tumor, epileptic - more than 30 in total!), there are degrees of coma: precoma, coma I-IV degree. In case of coma of the 1st degree ("moderate"), contact with the patient is difficult, but still possible. Unfortunately, in life, a safe exit from a coma is not as common as in the movies. Irreversible damage to the cerebral cortex occurs, as a result of which the patient can go into a vegetative state (popularly - "vegetable"), without regaining consciousness. Even if we assume that the auditory analyzer of such a patient at the level of the cerebral cortex is not damaged (that is, the patient "hears"), the patient cannot understand the meaning of these sounds, since he is not conscious, and numerous areas of the cortex are most likely damaged.