Here is a list of verbs that start with STO.
stock, stocking, stoked, stole, stolen
stomped, stomping, stoned, stood, stooooomp
stoop, stooped, stooping, stop, stopped
stopping, stops, store, stored, storing
storm, stormed, storming, stowed
Hope you enjoy this page of verbs that start with sto and the rest of this verb list site as well.
Did I miss any verbs? Visitors can make this a more useful online resource by listing more verbs in the comments.