From site:
The phonic monsters are a fun way to learn and practice phoneme-grapheme correspondences. The phonic monsters are a series of 18 plus words that contain all of the phonemes in the English language and most of the basic graphemes that are used to represents these phonemes. Each word is depicted as a monster with a head, a belly, and a tail, which represent the CVC words. An extra set of legs can be added later to make CCVC words or CVCC words. The concept is best explained with illustrations.