You can have as many <tbody> elements as you want, but no more than one each of <thead> and <tfoot>. Reference:
Content model:
In this order: optionally a caption element, followed
by zero or more colgroup elements, followed optionally by a thead
element, followed by either zero or more tbody elements or one or more
tr elements, followed optionally by a tfoot element, optionally
intermixed with one or more script-supporting elements.