Courge does mean squash. Potiron and citrouille are both the words for pumpkin, as the word pumpkin in english encompasses multiple varieties of squash, however, potiron only includes a specific variety of squash falling under the catergory of pumpkin, same thing for citrouille.
Citrouille or potiron is the word for pumpkin in french, depending on the variety of squash as pumpkin in english refers to multiple varieties of squash, whereas potiron and citrouille refer to specific varieties of squash that would be called pumpkins in english. Also, courge in french means squash.
Orge, when translated on google says "barley"