Can they give blood transfusions to stroke patients when first receiving emergency care?

If that is: The therapy chosen by the specific treating physician for that specific patient at that specific time. Your question is too generic and not appropriate for the general population at large.

Perhaps: Blood transfusions may be needed with severe anemias, or active bleeding, and may be required in some complex co-morbidities associated with stroke, but the more common infusion is t-pa, thromboplastin activator to reverse the stroke.