First there was Godzilla, from the Japanese gojira, a portmanteau word combining gorira 'gorilla' and kujira 'whale'. Next came Mozilla, presumably the combination of mosaic (the old-school NCSA web browser) and Godzilla. In addition to these, we also have hogzilla, south Georgia's monster hog, and the (newly coined?) catzilla for a huge feline terrorizing London. I think it's time to recognize a new productive morphological process in English for monsterizing or humongofying any noun: combine the first syllable of that noun with the suffix -zilla. Some other examples I found with Google: truckzilla, lawzilla, and medzilla. Also, note the difference in hit count between properly-formed choczilla (one syllable before the -zilla, 92 ghits) and the malformed chocozilla (two syllables, 7 ghits).