From the Super Mario Wiki
Spikesters are stronger relatives of Spikeys and weaker relatives of Oerlikons, and likely relatives of Spinies. These creatures were green-shelled, unlike the purple Oerlikons and the red Spikeys. They have only appeared in Super Mario RPG: Legend of the Seven Stars. Spikesters were common in Booster Pass; most of them were dropped by a Lakitu flying overhead. They did not appear anywhere else in the game. They only have one special attack and in battle they are joined by Carroboscis and Artichokers.
Names in other languages
|｢毬」 iga means "burr" and ｢兵｣ hei means soldier (and was also used in Spikey's name).