* A fictional term: It could be part of a fictional world, like a book or movie, where it has a specific meaning.
* A personal invention: Someone might have invented the word for personal use, perhaps as a nickname or a playful term.
* A mistake: It could be a misspelling of a real word.
Without context, it's impossible to know what "prackle" might mean. If you can provide more information about where you encountered the word, it might be possible to figure out its intended meaning.