pettifogger

A lawyer whose practice involves petty matters or who lacks sound legal judgment or skills.

One who quibbles over trivia.

An inferior attorney or lawyer who is employed in small or mean business.

The rockling.

A lawyer who deals in petty cases; an attorney whose methods are mean and tricky; an inferior lawyer.

Someone who quibbles over trivia, and raises petty, annoying objections.

An unscrupulous or unethical lawyer, especially one of lesser skill.

a disputant who quibbles; someone who raises annoying petty objections

a person (especially a lawyer or politician) who uses unscrupulous or unethical methods