Will shelter come and catch baby kitten's that was left on my porch

If you call them and explain your situation I'm sure they will help.

I don't have a cat, they were dropped off at my house, I can't catch them im disabled

Someone would have had to put them in a drop box at the shelter or personally return them, animal services will only deal with calls - so unless someone reported you or they ran away, there is no reason for them to interfere. Give them a call and ask if they have your cat, they love it when their owners are found!