The fictional language used by the BFG in Roald Dahl’s novel is Gobblefunk.
Gobblefunk is the BFG’s playful way of speaking, filled with invented words, unusual grammar, and comic misunderstandings. Examples include “snozzcumber,” a fictional vegetable, and “frobscottle,” the drink associated with the giants.
Dahl uses the language to make the BFG sound distinctive and to show how Sophie gradually understands him. The wordplay is not a separate language with a complete official grammar; it is a creative vocabulary and speech style woven through the novel.
Readers sometimes mistake individual inventions such as snozzcumber or frobscottle for the name of the language. Those are terms within the BFG’s speech, whereas Gobblefunk is the broader name for his wordplay and invented expressions.