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There does not appear to be a name for it.
because ducks wee on it. Sorry that's not right....Duckweed is a weed that floats on water (most likely ponds), it collects insects that ducks tend to eat.
Weird
Quodophile.
Someone who collects everything would be called a hoarder - this type of person may have OCD as well.
Some of the names given for a person who collects trains:model train collectormodel train enthusiasttrain modeler
That's an entomologist.
Gun-collector
usher
The person who studing about the shell is calles as chonchologist.
Arachnid collector or Arachnophile.
simple - eraser collector!