Springshell is a variety of Badnik created by Dr. Eggman, encountered by Sonic or Tails in Sonic the Hedgehog Triple Trouble.
Found in Great Turquoise Zone, these Badniks are based on the same concepts as the Boing-o-Bots from Sonic Chaos, only they are modelled after sea turtles rather than ladybugs. Like their brethren from the previous game, they roam back and forth with Springs on their shells that will bounce the player upward, and to destroy them requires the player to roll into them from the sides. Several of these Badniks appear during the fight against the Tart Turtle to help the player reach the boss.
Like other robots in 8-bit Sonic games, no animal friends pop out of these bots when they are destroyed. Whether these Badniks canonically don't contain organic batteries, or the escaping critters simply aren't shown due to programming limitations, is not known.