I have an extensive listing of current and historical community names in Plaquemines Parish and there is no listing for "Estonia." This is not surprising since many people named their houses, camps or small clusters of camps and those names were hardly used outside of the immediate vicinity. If Frederick died in Plaquemines, where his parents lived, I believe it would have been on Southwest Pass. The Kigers and Andersons were residents of Southwest Pass at the time. There was a Bar Pilot by the name of Anderson who lived in or near Pilottown Bayou near the mouth of Southwest Pass. Nearly all bar pilots lived at Pilottown Bayou since the current Pilottown had not yet been built. In 1900 the Corp of Engineers began building Burrwood and installing Eads jetties near Pilottown Bayou so there was a lot of work there at the time. My suggestion would be to check the census for someone who was born or was from Estonia, had a boat named "Estonia", or if there was a company (and there were many companies) working in the vicinity named Estonia. Your next best possibility would be that he died somewhere on South Pass as the Corp had taken over Port Eads and was doing a lot of work there in 1900.