Nowi, Fae, Tiki, and probably Myrrh.
Nowi because the only competition she has is M!Kana (who has very limited merges), Ninian (not on the list, and is a 5* exclusive), and F!Corrin (not on the list). Not only that, but Nowi has practically become a staple in 95% of Dragon Emblem teams because of her bulk and availability.
Fae is the only green dragon that is not a 5* exclusive, giving her more opportunities to merge.
There are only 2 red dragons, and they're both Tiki, and one (young) is a 5* exclusive... so yeah.
I chose Myrrh because she's in the regular summoning pool while F!Grima is only available on B8 banners, so you'd have more opportunities to merge her than you probably would with F!Grima.
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