The details of Devour from the Tahm Kench article on League of Legends wiki:
ACTIVE: Tahm Kench swallows an enemy non-champion or allied champion, making them untargetable and unable to take any actions for a short duration.
So I wonder, can a Tahm Kench eat another Tahm Kench that has something in its belly? For example, a Tahm Kench ate an ally Jinx and the enemy Tahm Kench comes. Ally Tahm Kench already has 2 stacks of An Acquired Taste. Is it possible for the enemy Tahm Kench to swallow the combination of Jinx and Tahm Kench?
What will happen if the answer is yes? Will Jinx be spit out while inside the enemy Tahm Kench first? Or will both Jinx and ally Tahm Kench be spit out at the same time?