Is there any free trial hosting cpanel ?

Hostgator has a coupon code for 1 penny for the first month. Try 1CENTWORKS, if that does not work just google for another one.

Trial account for 2 - 3 month won't be possible, however you can ask for 1 month trail with any reputed hosting companies in the market. If they find you as potential clients, companies will provide you trial offer ,so you can check how it works and then come up to a conclusion.

In most cases there should be money back guarantee offer from the hosting company, which could be considered as a trial time for the customer, so if no satisfaction - no questions to ask, but full refund.
If you wish to just test and control panel, features, etc. there's for example demo version of the popular cPanel - http://x3demob.cpx3demo.com:2082/login/?user=x3demob&pass=x3demob
or WHM - http://demo.cpanel.net:2086/login/?user=demo&pass=demo

Most good web hosting providers offer a money back guarantee which is essentially a trial period. Some offer a 45 day, or more, money back guarantee with cPanel shared hosting which gives you ample time to try the services to see if they are for you.