Plural form: multiple fish of the frostfish species, or various fish associated with freezing conditions.
Regular English plural formed by adding '-es' to 'frostfish' (following the rule that words ending in 'sh' add '-es'). Maintains the compound structure of the singular form.
The plural of 'fish' is tricky in English—you can say 'fish' or 'fishes,' and 'frostfishes' shows how compound words inherit the pluralization rules of their last part, making English plurals delightfully complex.
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