甘じょっぱいって英語でなんて言うの？

Sweet and sour is given to a dish that is more salty then sweet, but it has both flavours. Salted desserts is used for dishes that are mainly sweet but have a small salty taste too.

This sounds like a very bad combination. Although small amounts of sugar are sometimes added to savoury dishes the overall taste is usually either savoury or sweet rather than both. However there are many new types of food such as chocolate covered pretzels, Salted caramels, Chocolate-covered bacon, Ice cream and pretzels, and the classic kid combo -- French fries dipped in a milkshake. If you like any of these then they are 'salty and sweet.'

You say "salty and sweet taste." These biscuits has a salty and sweet taste. The yellow candy has a salty and sweet taste. I'm not a big fan of salty and sweet tastes.

When something tastes sweet and salty at the same time, then you can say something like: -I like dishes that are both sweet and salty. It's like having a explosion of taste and flavor in my mouth. -My friend makes a delicious sweet-salty chicken stew. He always makes it when I visit him

I can't think of any food that is both sweet and salty at the same time. I do know that there is a chinese dish called sweet and sour chicken.