Senior Member. Those are the accepted inflected forms of the word; I've heard and probably used "huger" and "hugest" occasionally in informal contexts. They do sound a mite hyperbolic or more suited to the breathless utterances of an excited child.

How do you spell Hugh as in large?

adjective enormous, great, giant, large, massive, vast, extensive, tremendous, immense, mega (slang), titanic, jumbo (informal), gigantic, monumental, mammoth, bulky, colossal, mountainous, stellar (informal), prodigious, stupendous, gargantuan, elephantine, ginormous (informal), Brobdingnagian, humongous or humungous ...

How do you use huge?

"There's a huge hole in the ground." "A huge crowd gathered outside the hotel." "There is huge demand for the product." "They made a huge effort."