I assume you speak of the ASM (adult stem cell) found in the human body. These include the hematopoietic stem cells found in the bone marrow, and the neurogenic multipotent progenitors found in both the hippocampus and the olfactory bulb.
is it true that there are also stem cells found in fat within humans?
I have not encountered them at all, but there might be. Stem cells are my own focus of study, so I will definetly look deeper into this. Just remember that any ASM has extremely limited use. The Embryonic Stem Cell is still the only stem cell that can generate any type of tissue.