"Prize sap" is a derogatory term that describes a person who is naive, gullible, or easily deceived. There are various synonyms that can be used to describe such a person, including simpleton, dupe, patsy, sucker, fool, and stooge. These terms suggest a lack of critical thinking or judgment, and they can be used to describe individuals who are taken advantage of or exploited by others. Other synonyms for "prize sap" might include chump, mark, or pigeon, all of which imply vulnerability or weakness. Ultimately, these synonyms reflect a common theme of victimization or manipulation, highlighting the importance of being cautious and alert in one's interactions with others.