By request, I've done a brief review/overview of the excellent third party Mastodon app @Tusky for Android:
https://fedi.tips/tusky-for-android/
It has lots of extra features such as draft posts, post scheduling, custom timelines etc.
Hopefully this overview is accurate, do let me know if you spot mistakes.
Overall, it's a really solid app packed with features and an easy to use interface, anyone with an Android device should try it. Recommended
Tusky has polls!
You can add one to a post by clicking the attachment button and then select Add Poll
Yeah, it's kind of hidden...
I've added it to the article as a drawback and tip as it is kind of easy to miss.