Proper names, such as Tin-tin, do not change from one language to another.
tin collector
The plural of tin is tins.
Tin is a chemical element with the symbol Sn. The Latin name of Tin is Stannum
tin foil, tin cans, rubbage cans, tin statues, tin mint cans (pokemon tins, mint tins), ...
4 Red Tins For Every 1 Blue Tin
I believe you are thinking of Rin Tin Tin.
For opening tins
A tin-opener.
Rin Tin Tin I presume you mean. He technically had no sidekicks, he simply worked to save others.
I'm assuming you mean, who voices the character in 'Secret of the Unicorn'? In which case it is Jamie Bell. And Andy Serkis voices Captain Haddock.
The electronic configuration of tin is: [Kr]D10.5s2.5p2.
Tins use began about 3,000 years ago so the name of the person who first used and discovered it is lost to history.