Please don't get offended but it's too funny!
I've never heard of a Tonchio (and now I know what kind of insect it is...) but why 'Passeggino'?
However, not those nor Locusta or Scarafaggio.
I'll add another clue but this will cost you
The same company offered this vehicle #2.
Vehicle #2 was named after that insect too (and in italian it was quite obvious to call these kind of vehicles in that way, just like 'buggy' is quite obvious in other languages).
The price you'll have to afford, now, is that, actually, the puzzle car was named xxxx yyyy, were x is always the same insect and yyyy is a bodystyle...now I'll need them both!