When you have multiple accounts setup in Tokodon there isn't a way to determine which account the notification corresponds to. It would be great to see notifications that include the account name/username popup if there is more than 1 account setup. A notification would show: Tokodon Bob's Mastodon Account (bob@mastodon.social) John followed you.
I went to check, and this exists already believe it or not :D In the top right corner of a notification (in Plasma) next to the application label is the username. It works identical to NeoChat in this regard.