Fakie ponies are rarely identified in listings, so it can be challenging to find a particular model. Usually they just show up in My Little Pony lots. These are some of my go-to searches for turning up interesting lots.
(This searches all categories. There will be some off-topic items, but I like to keep the terms broad to get the most results.)
(Most toys listed as horses tend to be the more realistic-style. There are still interesting ponies that show up under this search from time to time.)
eBay search: fakie pony lot / eBay search: fakie pony
(Some sellers will separate fakies and sell them as such. I’ve found some fun lots this way.)
The brands that are marked somewhere on the toy have a higher chance of being found in a search: