He seems to have a plush doll of every other character aside from Spring Bonnie, why is that?

Also, if the Spring Bonnie is a 'fingertrap', would that make Fredbear Plush one as well? why would one plush have a feature the other doesn't if they're both based on springsuits?

It seems very odd to me, considering when you think of the game, the only five major animatronics are all versions of the plush dolls claiming to be the Crying Child's friends, while the only one not given an immensely terrifying visage is Spring Bonnie. Regardless of whether you believe Plushtrap is a nightmare or not, it's very clear that whoever is having the nightmare is not nearly afraid of it as much as they are the other characters.