Is there any difference between two with shape of the balls or else. Explain it.
The term bowling has been derived from the verb 'bowl' and not the noun 'ball'. You 'bowl a ball', and not a 'ball a ball'. Therefore, it's called bowling, and not balling.
Saqlain Mushtaq was the inventor of the 'doosra' and he bowled it quite well-A 'googly' is a delivery that a leg spinner-