Questions about Tahm Kench the River King

I have a few questions after reading his reveal:

1. Are enemies (both minions and champions) rendered immune from CC and damage while in his belly? E.g. if ally mordekaiser mid ults someone, and morde has rylai's and liandry's, will the target take full damage plus slow bonus liandry damage while in Tahm's belly?
2. Assuming (1)'s answer is that it does not make them immmune to damage/cc, Is being in Tahm's belly considered movement impairing for the purposes of anything that checks it? E.g. if Tahm is built tanky, and he eats an enemy Mordekaiser, will Morde deal reduced damage to Tahm for being movement impaired while in Tahm's belly?
3. Is Jungle Tahm anticipated as being A Thing? I can see Tahm doing stuff like smiting and eating Gromp, getting Gromp to low hp, then devouring him, turning around and spitting it at blue buff/etc.
4. Ultimate Ult Interaction: If kalista ults someone, then thresh drops a lantern and jumps in Tahm's belly, then at the right moment Kalista grabs the lantern, can Tahm teleport 4 people around the map? :-)

That's all I got. Thanks!