Megalodon is a good client, forked from a recent version of the official Mastodon app for Android (which is a fine client in itself). Megalodon also supports some extra features that some instances opt for via a forked backend, but it’s fully compatible with all instances. Here’s are some good place to find instances https://mastodon.fediverse.observer/list https://fedidb.org/software/mastodon
So much nuance, wow