Are laptop chargers replaceable?

Yes, they are.

Yes - you can buy replacements from Lenovo; or a third-party charger with IDENTICAL power ratings.

If the power cord is damaged and the laptop is still under warranty you can contact Lenovo support and they will replace it free of charge. They will require that you sent the old power cord back. Alternately you could always buy a replacement power cord from them if you want an extra one.

Besides power ratings, has to have IDENTICAL plug that goes into laptop. Varies with model.

Yes the charger can be replaced but you should also be able to straighten the jack plug with pliers. An extension cord can be used to effectively lengthen the charger cord so that you can plug it in out of the way. The jack plug on the side of the laptop is very expensive to replace.
Be glad that it did not break.

"charger is bent" do you mean the port where you plug into the laptop? If that is broken it is $50 to $100 to fix. It is called a Power Jack.
If it is soldered to the motherboard that is the most expensive repair.
If it is a cable connected port, that is easier to replace.

Yes… Plenty websites sell these

YES! Many websites and electronic stores sell them!