After a Heated up journey in The nether and the portal to the overworld nearby you came across a Bone big structure and You see a Dried/Dehydrated Ghastling, You picked it up carefully and came back to the overworld Wa... It made a Dehydrated WA sound indicating it's dehydrated, but if it's hydrated they make cute cat cooing sounds like WA WA sounds and the sad short story is They are trying to mimicking their mother a big ghast mother dying sounds and the baby ghastlings mimic their father or mother Ghast dying sounds and the sounds the ghastlings mimic are much more higher pitch, It was dehydrated, you need to put a pool of water on it