Chinese character 蓛

It means grain blended with cut grass as horse feed. The Eastern Han Shuowen Jiezi, a dictionary that explains Chinese characters, gives the earliest recorded definition. The written form combines 艹, a plant-related component, with 敇, which supplies the sound.

Later dictionaries also record a less common sense, “petty speech.” Read the surrounding sentence to see whether that gloss fits.

Are 𦵪 and 䔩 variants of 蓛?

Yes, both are variant forms. Taiwan's Ministry of Education variant dictionary lists 𦵪 and 䔩 as forms of 蓛. In a quotation, retain the form shown by the source.