Hm, I Just Got My FFG Endura 4, And I Absolutely Love It. The Fact That It Comes In My Favorite Color(Blue) Just Topped It Off. Great Knife, But For A Kid, Not Sure I'd Go With The Endura, Because It IS A BIG Knife. I Have A LOT Of Suggestions.
Spyderco Delica 4 - Colored, He Would Love It.
Spyderco Dragonfly - The Foliage G-10 One Would Send Him Over The Top I'm Sure.
Spyderco Cricket - It's Useful, And Has a Cool Unique Look, What Kid Wouldn't Love It?
Spyderco Ladybug - It's Small, It Locks, It's Useful, And Comes In Many Colors. - Get Him The Yellow Salt Version - Rust Free Blade And A Bright Color In Case It Gets Dropped In The Woods.
Spyderco Native - Just A Great Knife.
Spyderco Persistence - Not Too Big, Not Too Small, Grippy G-10 Handles, Great Price, And A Great Knife.
Spyderco Tenacious - Same As The Persistence Just A Bit Bigger.
Spyderco UKPK - G-10 Or FRN, It's A Slipit, But It's A Great Knife - Many Different Blade Shapes, Colors, Handle Types.
You Also Can't Go Wrong With A Spyderco Byrd.
Kershaw Nerve - Cheap, Good Knife, And He Would Love It.
Kershaw Scamp - My Personal Favorite Cheap Knife - Frame Lock, Nice Blade, Grippy G-10, And Tie Him A Lanyard - I Suggest Adding Tufglide Though.
Kershaw Skyline - It Has a Flipper, Awesome G-10, Not Too Large, Not Too Small, And USA Made.
There Are Many Other Kershaws, Scallion, Leek, OD-1, Packrat, JYD-1, And Many Others.
CRKT M16 Or M21, But Make Sure It's A Good Variant.
CRKT Drifter - I Have The G-10 One.
Benchmade Mini Grip
Benchmade Mini Pika
Benchmade Mini Ambush
Benchmade Pika II
Benchmade H&K Mini Ascender
And There Are Many Others.
Buck Nobleman - Perfect For a Boy.
Vic. Super Tinker - Great Knife, I Have A Brand New One, And I Love It, I Just Haven't Found a Use For It, But A Kid Would Use The Hell Out Of It.
Vic Classic - You Can't Go Wrong With A Classic Right?
And Many Others I Can't Think Of At The Moment.