Can a whole hood be made from foundation stitches?

I’m making a hooded scarf and the pattern for the scarf is all double crochet. The pattern for the hood says to crochet 16cm of foundation double crochet and then “do rows” until I reach 14cm in length. Does that mean the rows are also in fdc or the regular dc the rest of the scarf is in?

Sorry if this is dumb but I am new and unsure of the purpose of certain stitches