Who Owns The Dirt?

Quite as silly as the title implies but I am genuinely asking.

Location: Florida, United States

I live in a new build community. The community is about 3/4 built. My neighbor had a pool built. Naturally, the earth was excavated to make room for the pool. The dirt was piled into a mound outside their property line designated by a fence. The land that this dirt was moved to is owned by a developer who has not yet developed into a pad for the home builder to build a house onto it.

The dirt will have to be moved before the home building company is able to build the house and continue to sell homes to finish the community.

I am interested in this pile of dirt that will be a nuisance to the home builder and developer ( 2 separate companies). I think it can reasonably be claimed that this pile of dirt is abandoned by the original home owner and instead of piling it out in the front of the house as garbage, that they set it aside. Since this is no longer on their property, can I claim it as a discarded item similiar to dumpster diving? I would love to use it for my own landscaping purposes. My wife thinks I should ask the homeowners who built the pool.

Photos on the below imgur link to help visualize it.

https://imgur.com/gallery/R3nKbxF

Edit: It really didnt matter who had the legal right. Reality is whoever got to it first with a shovel claimed it. The pad got cleared to prep for homebuilding. Besides its completely not feasible that the home owner or third party pool company struck a deal with the now third homebuilder to enter the community over the multi years of development this community has had. The pool and dirt was placed before the new home builder came in. Homebuilder moved the homeowners discarded dirt, end of story.