Translation

The Japanese word for "Hedgepig" is hari-nezumi ハリネズミ.

Romaji ha ri ne zu mi
Hiraganaはりねずみ
Katakanaハリネズミ
Kanji 針 鼠
Meaning Needle Rat
School Level 小6 ✕

Loan-word

The word "Hedgepig" katakanized would be hejjipiggu ヘッジピッグ.
Romaji he jji pi ggu
Katakanaヘッジピッグ
Hiraganaへっじぴっぐ
Meaning Hedge Pig

Synonyms

Scientific name: Erinaceinae.

Further Reading

Wikipedia: Hedgehog (ハリネズミ)