There are 4 13-letter words that start with 'fro'.
| frontispieces | frontogeneses |
| frontogenesis | frowardnesses |
Note: These 4 13-letter words that start with 'fro' are found from the USA & Canada version of the tournament Scrabble word list.
Also see words start with fron, fros, frow, frog, frot, frou, frol, froc, from, froz, froe, fror.
4-letter words start with 'fro' (4)