@mismi,
You can actually teach carving with a "made" knife and soap. The "knife" is made from craft sticks with a slight edge.
The problem with knives and cub scouts are they need to be closely supervised. I am an asst scout master with boy scouts and remember working with cub scouts...Typically the wood carving merit badge is done in boy scouts...
I guess what i'm trying to say is all the wood carving or whittling knives mentioned will be razor sharp...and you should never try to wood carve or whittle with a dull knife...more injuries occur from that than anything...
Remember you "blood circle" and keep a close eye on them...