Ankylo Drill
The Ptera and Tyrannosaurus Dinozords, when in Thundersaurus Megazord mode, can combine with the Ankylozord to form Thundersaurus Double Drill Mode.
The Double Drill mode, named as it replaces the Tricera Zord leaving the Megazord with drill-weapon arms, can also use its massive armoured shell as a sheild capable of blocking and reflecting energy blasts.