You can use both terms, I'm just mentioning "toot" because it's more difficult to understand if you're new here :)
Officially it's not used on the current Mastodon software, but it's been used for years and is part of the culture here so it's still used frequently.
Also some third party apps use the term such as Toot! and Tooot and there's a desktop one called Toot (all three totally unconnected to each other