Hello.

My son has recenly started thai boxing and am in the process of buying some custom made shorts.

Can anyone tell me how you spell little dragon in thai?

Thank you

มังกรเล็ก

There are also many references to little dragon as มังกรน้อย on the internet.

I'd be a little careful about using 'dragon' in Thai. Apart from describing an imaginary animal it's also used as a euphemism for your willy. Telling the world that your son has a little willy might not be doing him any favours

มังกรน้อย would be more correct.

มังกรเล็ก would get association of "small willy".