The scientific name for the fear of jellyfish is thalassophobia.
simple: jellyfish phobia, that's the only name fore it
As far as we can determine, there is no specific name for the condition. One is tempted to say "hydraphobia," but that would not be correct.
There is no official phobia name for the fear of vipers. However the official phobia name for the fear of snakes is ophidiophobia.
The phobia name for the fear of monkeys is Cynophobia.
There is no name for fear of olives, but lachanophobia is the fear of vegetables.
Hylephobia is the name of the phobia related to the fear of materialism
Ballistophobia is the name of the phobia related to the fear of missiles
Limnophobia is the name of the phobia associated with the fear of lakes
Traumatophobia is the name of the phobia relating to the fear of injury
Ideophobia is the name of the phobia relating to the fear of ideas
Patroiophobia is the name of the phobia relating to the fear of heredity