Doesn't look like it. Yellow fungus is usually a bit more blotchy than that. Most of the yellow in those pics look like natural coloring. The only one that doesn't look natural is the first one. But that one looks more like your dragon may have gotten some food on it or something. Have you tried giving your beardie a bath to see if any of that yellow comes off? Try taking a q-tip and gently wash that spot.
Doesn't look like it. Yellow fungus is usually a bit more blotchy than that. Most of the yellow in those pics look like natural coloring. The only one that doesn't look natural is the first one. But that one looks more like your dragon may have gotten some food on it or something. Have you tried giving your beardie a bath to see if any of that yellow comes off? Try taking a q-tip and gently wash that spot.