Incoming flight from the USA at Helsinki Airport;
Departing ferry from Helsinki to Tallinn.
That seems like one passport page to me; however the rules per the State Department say two blank pages for Finland.
Both Finland and Estonia are in the Schengen Area, no passport controls (no stamps) when travelling between Schengen Area countries. Zero pages required.
We have 9 blank pages left and 10 countries to visit. Three of the border crossings will be within Schengen, so I think there is no page needed for those.
Correct. Since most of Europe in is Schengen, not sure how you can get 7 (10-3) non-Schengen crossings, unless you are doing a lot of travel in the Balkans or points east
The rules for Schengen countries are all the same, you get stamped once entering the Schengen Area, and once again exiting, that's all. Normally both stamps on same page. Same for Finland, France, Portugal or anywhere else in between, Finland is not different.
It is not the US State Dept. that decides this, it is the Schengen countries. Treat what they say as here-say (no more authoritative than posts on this forum)