Translation

feretto means "Ferret" in English.
It's a katakanization, a loan-word.

feretto is normally written with katakana, as フェレット.
feretto written with hiragana is ふぇれっと.
feretto does not have kanji.
Romaji fe re tto
Katakanaフェ
Hiraganaふぇ

Orthography Notes

  • フェ is a compound kana representing a single syllable with multiple characters.
  • ット contains a small tsu which makes the consonant of the syllable longer.

Synonyms

shiro-itachi 白鼬, Mustela putorius furo.

Further Reading

Wikipedia: フェレット (Ferret)