From third hand information, I gather that these are the Creata/Winner's Choice molds sculpted by Candace Liddy. Circa 1999, Creata stopped producing them (in the middle of "series III"). There apparently was a copyright violation by a company called "Toob". Breyer bought the line (through Candace, bankruptcy?) and began producing them in 2005.
Bucksking pinto romping foal
Part of the 2005 Breyer Mini Whinnies Foals set. Photo provided by Dorothy Graham.
Black romping foal
Part of the 2005 Breyer Mini Whinnies Foals set. Photo provided by Dorothy Graham.
Palomino sitting foal
Part of the 2005 Breyer Mini Whinnies Foals set. Photo provided by Dorothy Graham.
Bay sitting foal
Part of the 2005 Breyer Mini Whinnies Foals set. Photo provided by Dorothy Graham.
Bay blanket Appaloosa grazing foal
Part of the 2005 Breyer Mini Whinnies Foal set. Photo provided by Dorothy Graham.
Chestnut grazing foal
Part of the 2005 Breyer Mini Whinnies Foal set. Photo provided by Dorothy Graham.
Red roan blanket Appaloosa prancing foal
Part of the 2005 Breyer Mini Whinnies Foal set. Photo provided by Dorothy Graham.
Black pinto prancing foal
Part of the 2005 Breyer Mini Whinnies Foal set. Photo provided by Dorothy Graham.