Monstrous Compendium Vol. 1: Spelljammer Creatures
Frozen Sick
D&D Beyond Basic Rules
Basic Rules (2014)
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Monstrous Compendium Vol. 1: Spelljammer CreaturesFrozen SickD&D Beyond Basic RulesBasic Rules (2014)Sign in to view your library & saved favorites.
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Different people. I never specified anything about what feels sensible, just what the rules actually say.
Fair point. And yes, like you said, many swallowing creatures have Blindsight. The Tarrasque is a well-known example. Giant Frogs don't, though. But I don't think matters. Even if we don't consider the fact that swallow actions often explicitly give Total Cover to swallowed creatures, it can easily be inferred by the fact that there are several layers of fully encasing solid surfaces between a creature's own stomach and the outside of its body (I can't believe I even need to point that out)... And as we all know, Blindsight doesn't see through Total Cover.
The rules actually say that an Unseen Attacker has advantage.
As for whether or not an attacker is unseen -- that is generally determined by the DM as you've pointed out. The DM has to make a ruling about that based on the specific situation that is occurring in the game and there are plenty of edge cases that exist. The DM will use various rules such as Line of Sight, Heavily Obscured areas, and so on for guidance and then ultimately the DM just has to make a ruling about whether or not a creature can be seen. Whether or not there is an actual rule about whether or not a creature can see inside of its own stomach is beside the point because of course it cannot. If a DM claimed to be making a RAW-based ruling and tried to then justify the ruling by saying that the creature can see inside of its own stomach, then I would strenuously object. If a DM instead admitted that he would prefer to make a non-RAW ruling for this situation such that applying both advantage and disadvantage remains disadvantage instead of canceling out in this case and asked us to just go with it then of course that's fine. But "how would I rule it" is a different conversation than "what is the RAW". The OP was specifically looking for a RAW answer.
Yeah, but being swallowed doesn't actually provide total cover against the swallowing monster (I think I've only once used a swallowing monster, and I don't think the character who got swallowed ever tried to attack the worm, so...).