Help me identify this citrus tree!

[Amberlee92]

So I have 5 of these trees in my yard and there's obviously something wrong with them because the leaves are scarce and the fruit falls prematurely while they're still green. On one tree I found what looks like an orange so I'm assuming all of the trees would be the same if the fruit ripened. I'm in Tampa, Florida so they could be a number of citrus. Is this an orange and what can I do to produce fruit?

 

[Chuck]

It looks to me to be some variety of lemon because of the long slender leaves. I may be wrong. I also see shoots coming up from the base of the tree. These should be removed yesterday. One way to tell is to taste them

 

[Rajesh Sethi]

May be a lime tree, small green fruit

 

[Nytr013]

@Chuck explained this one well for me. Check out my similar thread.
https://www.gardening-forums.com/threads/citrus-roots.11611/

I think mine is just a step further from yours. I'm just a n00b to all of this, but I think your roots were damaged maybe by cold weather. Mine just stopped growing fruit.