This depends on where they work with disabled individuals. They could be a carer, a special needs teacher, a physical therapist and so on. It depends if you are referring to someone who supports the disabled at home, in a support centre, a school and so on. There are probably dozens of titles depending on this, you'll have to be more specific for an exact answer.
Patient!
sinical and heartless.
someone who works for a business
DisabledPhysically challenged (if physically disabled)Mentally challenged (if mentally challenged)SpecialOr even better:ChildrenWhy should you treat someone differently or call them any differently just because they are disabled? They are still children, disabled or not. Societies need to "label" people is getting out of hand.
An employee
A herpetologist works with reptiles and amphibians. This includes snakes, lizards and frogs.
A gardener.
a horticulturalist
demonologist
collector
Mason
coach