From the Super Mario Wiki
Barbecue Guys are red invincible Shy Guys that push torches that erupt with a bar of fire, in which they trap Yoshi between. The only way Yoshi can escape is to keep moving along with them. When Yoshi reaches the finish, the Barbecue Guys put out their torches and leave. They are so rare, that only two appear in Magma Castle from Yoshi's Story.