A simple search will show you many tutorials on how to make pom pom balls. Some take tools and adult-size patience, but these require neither.
20 Pretty Pom Pom Crafts for Kids to Make and Play
Pompom Crafts for Kids
How to Make Pom Poms CREATIVE BASICS Episode 10
Package includes: package comes with approximately 1000 pieces round glitter pompoms with diameter of approx. 1.2-1.5 cm, which may vary slightly due
1000 Pieces Glitter Pom Poms 0.6 Inch Fuzzy Pompoms Arts and Crafts Balls for Hobby Supplies and Craft DIY Material (White)
Easy DIY Pompoms for Kids
How to Make Pom Pom Balls · Art Projects for Kids
27 Pom-Pom Crafts For You and The Kids
20 Pretty Pom Pom Crafts for Kids to Make and Play
500pcs Mixed Color Pom Poms 3/8 Fuzzy Pompoms Balls Art Supplies DIY Creative
5 Super Easy Pom Pom Crafts