For the gooey substance:
* "Bave" - This is the most common word for slime, especially in the context of something slimy or disgusting.
* "Glaire" - This refers to a more viscous, mucus-like slime.
* "Gelée" - This is good for a more gelatinous type of slime.
* "Glu" - This is a general term for glue, but can also be used for slime depending on the context.
For the toy:
* "Slime" - You can simply use the English word, as it's becoming increasingly common in French.
* "Pâte gluante" - This literally means "sticky paste" and is a good alternative.
* "Colle gluante" - This means "sticky glue" and can be used as well.
Ultimately, the best translation will depend on the specific context and the type of slime you're referring to.