As far as I know, "bobulous" is not a commonly used word in standard English. However, if we assume it means something like "full of bubbles" or "foamy", some possible synonyms could be "bubbly", "frothy", and "spumy".
"Bubbly" is a widely recognized term that implies being full of or producing bubbles. For example, "The champagne was bubbly and festive." This shows that the champagne had a lot of bubbles, similar to something that might be described as "bobulous".
"Frothy" also conveys the idea of being light and full of foam. For instance, "The ocean waves were frothy as they crashed onto the shore." This description brings to mind a foamy quality, which could be comparable to something being "bobulous".
"Spumy" is a more technical or less common term that means foamy or frothy. For example, "The beer had a spumy head." This indicates that the beer had a foamy top, similar to the concept of being "bobulous".