If your crown is made out of metal, then yes, it would be normal. It will take a while to get used to the new item in your mouth, but after a while it might go away.
Yes please. Initially u will feel a little ackward but in the course of time u will get habituated to it. It is natural that the tongue will again and again touch the metalic crown and u cannot avoid it even if u wish but it will not spoil yr normal taste of delicacies.