Here's the lyrics to [bad word] Maru Mori Mori by [bad word] and Tomoki (and sometimes Mook) so you can all sing along! 

 [bad word] maru mori mori minna [bad word]  [bad word] maru mori mori We’re gonna eat everything 
 [bad word] tsuru teka teka [bad word] [bad word] kana?  [bad word] tsuru teka teka Will it be clear again tomorrow? 
 Wasuremon sunnayo (Mook talking) 
Don’t’ leave anything behind. 
 Ookiku nattara osora ni koe ga todoku kana? 
When I grow up, will my voice reach the sky? 
 Itsu ma de demo issho dayo 
We’ll always be together. 
 [bad word] maru mori mori minna [bad word]  [bad word] maru mori mori We’re gonna eat everything 
 [bad word] tsuru teka teka [bad word] [bad word] kana?  [bad word] tsuru teka teka Will it be clear again tomorrow? 
 Kanashikute naiteita hitori [bad word] kaerimichi 
I was so sad, I walked alone crying on the way home 
 Konna toki honwaka na 
At times like this, the warm [bad word] 
 Minna ni aitai na 
everyone, I want to see 
 [bad word] maru mori mori Omajinai dayo  [bad word] maru mori mori It’s a magical spell 
 [bad word] tsuru teka teka Nikkori egao  [bad word] tsuru teka teka sweet smile 
 Ichi ni no san shi de goma shio-san 
1, 2, 3, 4 and goma-shio-san 
 Takusan dato oishii ne 
It tastes good when you eat with many people 
 [bad word] maru mori mori Puka puka ofuro  [bad word] maru mori mori Floating in the bath 
 [bad word] tsuru pika pika Goshi goshi burashi  [bad word] tsuru pika pika [bad word] brush 
 Mina-san gunnai mata [bad word] 
Good night, everyone, see you tomorrow 
 Asagohan wa nandeshone? 
I wonder what’s for breakfast? 

 Onaka [bad word] [bad word] yo (Mook talking) 
Cover you tummy when you sleep 
 Yoku [bad word] (Mook talking) 
Good job