Based on crustaceans, Taga-Tagas have an oval, blue-armored body with silver spikes covering their back and a head covered mostly by a red head plating. Underneath their head plating, they have a black face with black eyes. They also have stubby, yet thick arms with a red claw on each of them, and a rear tube.
In Sonic the Hedgehog CD, Taga-Tagas are found in two Rounds. They first appear on the top pathway in Palmtree Panic Zone 2, where only two of them can be encountered. In gameplay, they hop in and out of waterfalls to attack the player, similar to the Choppers. These Taga-Tagas show no signs of decay in the Past or Bad Future timeframe.
The Taga-Tagas later appear in Tidal Tempest as standard underwater enemies. In gameplay, these variants of the Taga-Taga swim in a straight line from left to right. As the player approaches, they will fire off the three spikes on their back, then dash away. In the Bad Future or sometimes the present timeframe of this Round, the Taga-Tags have lost their spikes due to decay. As such, they can only swim away at the first sign of danger.
Both types of Taga-Tagas can be defeated by using the Spin Jump underneath them. They are also powered by Little Planet flower seeds which will pop out of them after being defeated.
Due to water resistance, it is impossible to catch up to Taga-Tagas after they swim away in Tidal Tempest.