Ascalaphus
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The critter might have more than two stomachs (if so, it will receive explicit mention in the description). However, if you're in one of the cut-open stomachs, why are you still in there? And if not, then obviously it's not really helping you.
Although if a GM ruled that at some point the monster's "Swiss Cheese Threshold" has been met and that swallowed creatures are now in LoE, I could accept that. Just make sure it applies to fireballs and channels consistently.