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Results found in several dictionaries: Collins, Collaborative Dictionary
scribbling 
a  n garabato  m 
b  cpd 
 scribbling pad  n bloc  m  (para apuntes o para borrador) 

Collaborative Dictionary     English-Spanish
'scribbling' found in translations in Spanish-English dictionary
escarabajear vt. scribble Reverso General Dictionary 
plumear v. 1) scribble (vt), 2) hatch (vi) Reverso General Dictionary 

"Collins Spanish Dictionary 8th edition published in 2005 © William Collins Sons & Co Ltd 1971, 1988 © HarperCollins Publishers 1992, 1993, 1996, 1997, 2000, 2003, 2005"