Paul Gendrop refers to this type of panel as "cascading mask panels". The figures in these panels are very abstract and symbolic representations of serpent heads.
The panels at Hochob are "elaborate and exquisite, where the eyes, inter-eye spaces, maxillaries, fangs, and tongue form an elegant and carefully controlled interplay of lines. The earplug-upper volute-bone pendant trio is often complemented by volutes of smoke, or, more frequently, by bil or germination symbols."
Paul Gendrop, Rio Bec, Chenes, and Puuc Styles in Maya Architecture, p. 78.