@MarkBrigham
Using the ellipsis (3 dots) below the toot, it brings up a menu which includes Report. It can also be done from the ellipsis on their account page.
As always, fedi.tips has this covered

https://fedi.tips/how-do-i-report-a-post-or-account-that-is-doing-something-bad/

@stux

@FediTips
Just spotted, and reported/blocked, another of these, with the oddity that this account is over 3 years old, but has been pumping out this same content engagement spam in the last 24 hours.
jvroj[@]mastodon.social another of these “ro-bot helper” account names.

Not that often you spot a dormant spam account, like this, in comparison to the very fresh, brand new accounts.