The jets on this rocket? thanks!!!

My guess is they are fondant tubes. They look unequal to me....but it just might be the way the pic is taken.
Make hollow tubes of thick fondant or gp; then when dry fill w/a 'cork' of yellow fond or gp.

That is what I was thinking, thank you so much!

The clouds on the sides look higher than in the front. Maybe there's a support in them that helps them sit?