ce qu'on appelle des crimes sans victime, de prétendus crimes sans victime (the latter implying that there may be victims after all)
You would say "les crimes dits sans victime" in French.
"Crook" in French is "faux" and "flail" in French is "fléau".
"Serial killer" in French is translated as "tueur en série."
J'habite à Croydon if you want to say, "i live in crodon" But, if you are telling someone where they live, Tu habites à Croydon (if they are a friend (informal) or Vous habitez à Croydon (if formal)
The word for villain in French is "méchant" or "villain" if you want to use the English term.
Crime scene investigation in French is "l'enquête sur la scène de crime."
le cerveau, or (for crimes) l'instigateur.
In French, you would say "is called leonie" as "s'appelle Léonie."
called (as in he is called) is (il s') appelle in French.
the meercat is called 'suricate' in French.
Canola is called 'colza' in French.
Wimbledon is called the same in French.
Banksy is called the same in French.
USB is called the same in French.
Their names are
"how do you say he is called" is translated "Comment est-ce que tu dis qu'il s'appelle ?" in French
You can say "Ma mère s'appelle" in French to express "my mother is called".
candy is called "sucrerie" in French.