Yes, but only with a great deal of work. Each blank place on the form must have a field into which the user can type. That field may have additional properties that restrict to just letters or just numbers or a certain number of decimal places or $ sign, etc. You decide whether you want to go to the trouble of creating all those little fields and scootching them around with your mouse til they fit just so you can type in them on the screen. Might be easier to find a standard old typewriter or a pen?
I have Adobe Acrobat 6.0 Pro and have received a PDF file that is not fillable (and apparently not protected.) Is there a way to change this file so that I can type in my responses to the questions on the form (without OCR)?