Rellenas
llenó
If you are talking about the toy, stuffed animals are called "peluches" in Spanish. If you are talking about taxidermy, they are called "animales conservados con apariencia de vivos"
materia
That is the correct spelling of "ravioli" (a stuffed pasta dish).(A single piece would be called a raviolo.)
"pain farci" is how you say ,"stuffed bread" in French.
a spanish webinz stuffed animal
it is alarge green chili stuffed with white cheese, battered and fried. Relleno means stuffed in Spanish.
Stuffed flounder would be fylld flundra in Swedish.
Pimiento
You may say 'nuigurumi.'
No, not literally, like a stuffed-animal would be. But, you can be stuffed as in, the expression, stuffed meaning you are too full or satisfied. It might be something you'd say at an all-you-can-eat buffet.
No thanks, I'm stuffed