We don't have synonyms for tortle yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are tootle, turtle and tottle.
(n) :
Obsolete form of turtle. [(zoology, US, Canada) Any land or marine reptile of the order Testudines, characterised by a protective shell enclosing its body. See also tortoise.]
(n) :
Obsolete form of turtle. [(zoology, US, Canada) Any land or marine reptile of the order Testudines, characterised by a protective shell enclosing its body. See also tortoise.]