Is it normal to use a bar of soap to wash your hair?

And!

Yea, I do that sometimes.
I find that it gives it a good smell, although it may make my hair really dry and frizzy.

I too have very short hair and only use soap. All the modern shampoos and conditioners are nothing but chemicals. In the end, they will damage your hair and follicles. Stick with the soap, and don't worry about it.

I sometimes use organic soaps in my hair: caramel, rosemary, papaya & almond butter :).

That's exactly what we used before shampoo was invented and I've done it when travelling.