Fable: The Lost Chapters

No, that's the only way. Win them all, and take them to the school teacher.

You can however buy a few hero dolls or find them in some containers but most of them are only obtained through pub games. P.S. Try using the Slow Time spell while playing them to get an advantage.

Using Slow Time only affected pub games in the original Fable release. It doesn't work in this version.

The only doll that can be purchased is the Thunder doll, which cannot be won. The other five have to be acquired via pub games. And the Doll of You doesn't count towards the six you need; you need Thunder (bought at Bowerstone North or the Arena), Briar Rose (won in Bowerstone Soth in Card Pairs), Whisper (won in Oakvale in Coin Golf), Scarlet Robe (won in Knothole Glade in Card Sorting), Maze (won in Hook Coast in Shove the Ha'Penny), and Scythe (Lost Chapters only, won in Snowspire in Coin Golf).