SCRUM has some different terminologies when it comes to role names in SCRUM. Below is the list of roles with what actually they mean.
People with pig roles are those people who are committed to the project. If the project fails it affects these people. So of the pig roles are developer, customer, project manager etc.
Product owner means the end customer or user.
Scrum master is the process driver. These are the people who drive the scrum process. They are consultants for Scrum process.
People with chicken roles work indirectly on the project. They do not really benefit from the project but their feedback is valuable to the project. They can not be held responsible if the project is not successful.

Figure: - SCRUM Roles
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