A. The tongue will heal by itself if the cut is small. Unfortunately you cannot put anything on it, as your dog will ingest it.
Keep the wound monitored for the next hours/days; if your dog is in discomfort and not eating fine and if you think the wound is getting swollen or you notice any further discharge from the wound, I would recommend to take him to your veterinarian for a check up and possibly some antibiotics.
A. it depends how badly the tongue has been cut, some of those cuts sometimes need surgical repair or at least pain killers. If she doesn't seem to be eating or drinking it must bother him a lot. If he is eating and drinking and seem pretty happy then it's probably not too bad.
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