Yes, No and Maybe. How does that sound for clarity? :-)
A new hire is assigned an onboarding and integration plan (we call them templates) when they first start with the company. The plan generally included tasks and check-ins that are phased out over a period of time and are assigned to the new hire, their manager and their buddy/mentor. The goal of the plan is to engage, inform, connect, motivate and integrate the new hire with the company and their team as quickly as possible.
Depending on where the hire is within the plan, tasks and check-ins may be assigned to one or all of these actors.
In some companies, buddies/mentors are not used (we recommend everyone should use them). In those cases, buddies/mentors would not get assigned tasks or check-ins.