Manely, Musteed & Masculentaur besides being based off Stallions, there also based off diffrent hair styles with Manelys being a Shaggy hairstyle, Musteed being a Man bun & Masculentaur's being a Wild/Untamed hairstyle (btw all 3 of them are 100% Male so theres no female Manely, Musteed or Masculentaur)
Frustrafoul & Aggrox (Even tho it isnt rlly caribbean inspired) is based off The Roc which is a Giant Mythical Bird of prey (Most depictions of it tend to be a Giant hawk or eagle) its also capable of carrying an adult elephant
by Dependent_Welcome_27