What does El Vendedor de Alcatraces mean?

It means, "The pelican vendor."

Vendedor is "Vendor"

Alcatraces is "Calla Lillies"

So it means "Calla Lily Vendor"

While Alcatraces is plural for Alcatraz which means Pelican,

it also refers to Calla Lillies. Just like in English, some Words

can have more than one meaning.