Here are some of my ideas for a boys' Easter baskets ages 4-6. You can substitute the paw patrol theme for any character they like and base your concept around that.
These are the tags I'm using.
Wooden Easter Tags - Etsy
These small Lego sets are perfect for this age group.
Easter : LEGO Best Sellers - Target
Coloring books are always a good, easy addition to any Easter basket.
Amazon.com: Paw Patrol Coloring Books - 2 Pack
Sidewalk chalk are always a great addition.
PAW Patrol 5-PieceJumbo Chalk Set - ShopNickU
You can never go wrong with bubble wands.
Bubble Wands
A chocolate Easter bunny is a must.
chocolate easter bunny
The bunny and carrots are a perfect pairing.
Milk Chocolate Hazelnut Carrots 4-pk (1.9 oz)
This is going to be my bigger gift for this age group. There are many different character options.
Paw Patrol: Vehicles
Every Easter basket needs "eggs".
Kinder Eggs Surprise - Target
All of my baskets always get a little plush!
Squishmallows - Target
All of my kids get their favorite candy in their basket. Substitute for any kind your kid likes!
Crunchy Gummy Yummy - Nerds
Kinetic sand is a fan favorite at this age.
Kinetic Sand 4.5 oz Container - Blue
Play-doh is another great option!
Play-Doh Eggs 24-Pack Non-Toxic Modeling
These Dino smashers are super fun if your little one is into Dinos.
Dinosaur Egg Toys
If your 4 year old is anything like mine, they're obsessed with flashlights. Grab these paw patrol flashlights.