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.)
(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: