IPA: /ˈprɒdə/
KK: /ˈprɒdər/
A person or thing that pokes or pushes something to encourage action or movement.
The farmer used a prodder to move the sheep along the path.
Prodder → The word is formed from "prod" (from Middle English *prodden*, meaning to poke or thrust) and the suffix "-er" (meaning a person who). A prodder is a person who pokes or urges someone to take action.
Think of someone who 'pokes' or 'urges' others to do something — that's what a prodder does.