IPA: /ˈtɜːrtlər/
KK: /ˈtɜːrtlər/
A person who engages in the activity of catching or studying turtles.
The turtler spent the day searching for turtles along the riverbank.
The word 'turtler' is derived from 'turtle' (from Middle English 'turtur', meaning a type of reptile) and the suffix '-er' (meaning a person who). A turtler is a person who catches or deals with turtles.
Think of someone who is a 'person' ('-er') dealing with 'turtles' — that's what a turtler means.