The phrase "immature parasites" refers to organisms that are not yet fully developed and rely on a host for survival. There are several synonyms for this term, including juvenile parasites, larval parasites, and nascent parasites. Other terms that may be used to describe immature parasites include undeveloped parasites, immature organisms, and early-stage parasites. These terms are often used in the context of scientific research and medical studies, where it is important to accurately describe the life cycle and behavior of various parasitic organisms. Regardless of the terminology used, the presence of immature parasites can have a profound impact on the health and well-being of their host.