Poll, Polls, and Forms are 3 different apps (icon shown below) for the polling experience in the context of Teams meetings.
The Polls app in Microsoft Teams is a tool that allows you to create and conduct polls during a Teams meeting. It can be used to gather feedback, conduct a survey, or make decisions as a group. To use the Polls app in a Teams meeting, you first need to install it from the Teams app store. Once installed, you can create a new poll by clicking the "Create a poll" button in the app and entering the question and answer options.
You can then share the poll with the participants in the meeting by clicking the "Send" button. Participants can then respond to the poll by selecting their answer from the list of options. The Polls app will display the results of the poll in real time, so you can see how people are responding as the poll is being conducted.