There are several, Chichlids, Apogonidae, Ariidae, Jawfishes, Osteoglossids and Gourami
fighting fish
I think a mouth stick is the thing that the doctor (or maybe dentist) puts in your mouth.
It's possible.
a mouth guard
eggs
There are many different ways it is done but basically in most fish species the male fish sprays his spermatazoa on and around the ova of the female and a sperm finds and penetrates the ovum thereby fertilising it.
fish scales
Roundworms are transmitted from dirt. If a human picks them up with there hands and puts it in there mouth, that's how it's transmitted. The eggs and Larvae can also go through human skin.
Most do not but there are some species of tree frog which do.
The grasshopper digs a hole and puts her eggs in it. The hole helps protect the eggs from nature and also from predators.
Tis' actually called mouth to mouth. It is when you cannot breath and someone puts their mouth up to yours, and gives you 02, or, oxygen. Hope this helps.
they don't the girl puts the eggs in him