Especially within a field like cartoon generation, fonts are vital aspects of the design process. There are literally thousands of different font options out there today, and they each are a little different when it comes to the kinds of feelings or thoughts they help invoke.
There are several fonts that will generally be included in your baseline programs for digital design. There are also numerous other programs, both of the free and paid variety, that you can download featuring tons of additional fonts. And if you see a font you really want to use, utilize MyFonts.com, which will help you identify any font by uploading a picture.