User your leader's name instead of 'my leader' if it fits. Or, 'my counselor', 'Scoutmaster', or other title.

(cup hands carrying bee)
I found at camp a baby bumble bee
Won't my leader be so proud of me?
I found at camp a baby bumble bee...
Ouch! It stung me!

(squish hands together)
I'm squashing up my baby bumble bee
Won't my leader be so proud of me?
I'm squashing up my baby bumble bee...
Ew! What a mess!

(put hand in front of mouth like licking)
I'm licking up my baby bumble bee
Won't my leader be so proud of me?
I'm licking up my baby bumble bee...
Ugh! I feel sick!

(hold stomache and bend over)
I'm barfing up my baby bumble bee
Won't my leader be so proud of me?
I'm barfing up my baby bumble bee...
Oh! Another mess!

(pretend mopping, then stand tall and proud)
I'm mopping up my baby bumble bee
Won't my leader be so proud of me?
I'm mopping up my baby bumble bee...
Hey, leader, aren't you proud of me?

I found at camp a baby bumble bee
(clap loud)I got it before it got me!