The Swedish term "flina, fnissa, fnittra" matches the English term "giggle"

other swedish words that include "flina" : english :
flin, grina, grin, flina grin
other swedish words that include "fnissa" : english :
fnissa snigger
fnitter, fnittra, fnissa titter
other swedish words that include "fnittra" : english :
fnittrande giggling
fnitter, fnittra, fnissa titter