Student or Learner
1) How do we call the tube inserting into the nose of a patient to feed them liquid food.
2) Also, shall I call those as liquid food or not.
3) How should I make a sentence saying one is having that tube on for eating liquid food?
Pick some words from this: Nasogastric intubation - Wikipedia, the free encyclopedia if you want the specific vocabulary. But colloquially people just say 'being fed through a tube'. (By the nature of the process, what's sent down the tube is going to be liquid.)