Kids after testicular cancer? If I have testicular cancer, can I still reproduce?

While it is possible. To have testis cancer, it is easy to find out. Go to the doctor, tell him your worry, have examine you and teach you to eamine yourself. Testis cancer is highly curable, and may not effect fertility - other testis may be fine, but this too can be checked, as sometimes there are intrinsic low sperm production.
Depends. It depends on the treatment. The treatment usually includes removing the testicles, which would render you sterile. You could have sperm saved prior to treatment and then father children via artificial insemination in the future.