Can the synthesis of nanomaterials without any poisonous reactant materials or any organic surfactants using water as the solvent be included in green synthesis or not?
It can be included in green synthesis. According to the definition of green chemistry, any reaction or synthesis that minimize the use and generation of hazardous substances are a part of green chemistry. According to your question, since there is no hazardous chemicals involved, I think there is no problem in considering it as green.
Synthesis of nanomaterials is achieved in green Chemistry manner using plant extracts. you can search for a literature on Internet regarding recent papers availability.