Translation

pengin means "Penguin" in English.
It's a katakanization, a loan-word.

pengin is normally written with katakana, as ペンギン.
pengin written with hiragana is ぺんぎん.
pengin does not have kanji.
Romaji pe n gi n
Katakana
Hiragana

Further Reading

Wikipedia: ペンギン (Penguin)