Ha, found it.

http://forums.demigodthegame.com/352218

http://demigod.wikia.com/wiki/Yeti, from there you can look up what Morale and Horn of the yeti do, it's fairly explicit. Other than that, I believe http://www.demigoddb.com/ had planed to have minions stats added to the stat sheet, but for now, you will have to be patient.. or do the math ^^

One more question.

The Priest Healing page says that they can heal anyone within 10 meters. How far exactly does this translate to ingame?

http://spreadsheets.google.com/ccc?key=pmbS09ByNPGE-hT1mq5_XBQ should sort you out.

Here is the relevant info in a more readable format (base stats for each rank, only):

Sedna Yeti 1 - 810hp   18.0dps
Sedna Yeti 2 - 1110hp  22.2dps
Sedna Yeti 3 - 1410hp  26.4dps
Sedna Yeti 4 - 1710hp  30.6dps

*edit*

For comparison:

Priest range. 10 yards.

Regulus autoatk (unupg.) 15 yards.

TB Fireball range. 20 yards.

Warpstone. 15 yards.

nope its actually 9 yards.