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In page Pompom (goldfish):

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The pompom has a similar body shape and finnage to the lionhead or Oranda but instead of supporting a headgrowth it has nasal outgrowths. The extent of the nasal outgrowths, which are enlargements of the nasal septum, vary in pompom goldfish. In some, the outgrowths hang down past the mouth. These skin outgrowths around the nostrils of pompoms are developed through selective breeding. Pompoms may have either metallic or nacreous scalation, and can occur with or without a dorsal fin.[1][2] It will be best if the lionhead variety of these fishes are engaged with the same variety or other dorsal fin less fishes. [3]