Translation

suparoo means "Sparrow" in English.
It's a katakanization, a loan-word.

suparoo is normally written with katakana, as スパロー.
suparoo written with hiragana is すぱろー.
suparoo does not have kanji.
Romaji su pa ro o
Katakanaスパロー
Hiraganaすぱろー

Orthography Notes

Synonyms

suzume 雀, Passer montanus.

Further Reading

Wikipedia: 雀 (Sparrow)
hibari 雲雀.