remorse plays randomly generated morse code for you to copy by pen and paper.
You can control alphabet, speed, length, etc, run remorse --help for details.
You may want to pipe stderr to /dev/null when running it - alsa and friends generate a lot of warning messages that can usually be ignored.
For example:
remorse -a "krmso" 2> /dev/null
will play strings of morse code using the letters k, r, m, s and o. Once it has finished playing, remorse will print the string and then exit.