Create LOG files when creating multiple DATA files for tempdb?
No, SQL Server only writes to 1 LOG file at a time. So it doesn't help to create multiple log files for better IO performance. It will use the first file and only when that one is full and no VLFs are cleared it will continue in the second file, etc. etc.

You might want to create a second log file if for example you run into an emergency situation where you run out of disk space on disk X and you want SQL server to continue logging in a second file on disk Y.