Turbo Spiker, or Yadorin Jet (ヤドリンジェット) in Japan, is a wheeled hermit crab Badnik found in Hydrocity Zone. They fire off their spiked shells when approached and start rolling back and forth. However, since they fire they shells right away, they can be easily destroyed with a spin or jump. It appears to be a more improved version of another Badnik from Sonic the Hedgehog 2.
They return in Sonic Mania, again in Hydrocity Zone with the same attack pattern.
A variation of this Badnik, Yadokka, appears in Sonic Advance 3.