It seems that we're talking past each other. Nowhere have I asserted or suggested that people without the physical ability to speak are therefore unable to pray.
Further, I would not assert that all "speaking" is vocal. However, as I stated previously, that is the
normal method of communicating, and I am quite certain that is what Jesus had in mind when He taught the disciples to pray. It doesn't preclude whispering, speaking in one's mind, writing, or other expression. It is however, much greater than simply "asking" or "needing". For example, what part of "Hallowed is Your Name" an expression of need?
Do you ever just talk to God, without any particular need in mind? Do you ever share your thoughts about things with Him? Do you ever simply thank Him for some blessing? If not, I would submit that your relationship with Him is missing some wonderful facets.