Final answer:
The terms pettifogger, shyster, and ambulance chaser are insults directed towards lawyers who are perceived as unethical, and not formal legal terms.
Step-by-step explanation:
The terms pettifogger, shyster, and ambulance chaser are derogatory terms associated with the legal profession and more specifically towards lawyers. These terms are not formal legal terms but rather informal and typically used as insults that are aimed at discrediting or maligning lawyers who are perceived as unethical or unscrupulous in their practices. A pettifogger might be a lawyer who deals with petty cases or employs dubious practices, a shyster is a lawyer who uses unethical or misleading tactics, and an ambulance chaser is a term used to describe a lawyer who seeks out clients at a hospital or a disaster site, often perceived as taking advantage of someone's distress for personal gain.