Turtle Mimicry – The ability to take on the form and/or characteristics of a turtle.
Adwaita is an alien that resembles a turtle in the Ben 10 universe.
Fastback (DC) is a turtle that ironically has super speed (DC Who’s Who #7).
The Dragon Turtle is a cross between a turtle and a dragon (TSR 2102 MC1 Monstrous Compendium).
Turtles could be good mobile bases if they are larger (Strange Adventures V1 #118).
Experiment 247 (Marvel) – Tales to Astonish V1 #1
Giant Turtle – TSR 2158 Monstrous Compendium Annual Volume 2
Zaratan – TSR 2140A Monstrous Manual
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