If they don't explicitly say they are, they aren't.
Kraft marshmallow cream is kosher in the US. Otherwise, you could check with kosher food stores for other brands of this product.
There are brands of kosher imitation crab meat. You would have to check the product packaging for kashrut certification.
Fish and chips can be kosher so long as the fish used is a kosher species and the food is prepared in a kosher kitchen with all kosher ingredients.
There are brands of Ginger Ale that are kosher.
Many major brands of mayo are kosher.
Many brands are kosher. Here are just a few: Icy Treatz It's Delish
There are kosher brands of l-taurine supplements. You would have to check the packaging for kosher certification.
Delicatessen places serve kosher food. And if you are talking about 'deli' food, it is usually kosher. _______ Delis are only kosher if they're kosher certified. Most delis aren't kosher.
Kosher refers to food that is prepared according to the laws of kashrut. The people who keep kosher are Jews. Kosher is a classification, not a people. That being said, if the nachos and salsa are certified kosher, religious Jews who keep kosher can eat them.
When correctly slaughtered, goat is a kosher meat.
Frog legs are not considered kosher food.
The problem is the gelatin. Most brands of Gummy Bears are made with non-kosher gelatin (manufactured using ingredients derived from the innards of pigs), meaning the candy itself is not kosher. There are, however, a couple of brands made for Jewish and Muslim audiences (Muslims too cannot eat non-kosher gelatin). I enclose a link to one of those brands of kosher Gummy Bears.