Athlete ankle/foot pain? A whole team with Sever’s? Something must change. My suggestion to the coaches with this issue… Don’t make them tumble or land on hard surfaces for a month. I bet half the issues will resolve themselves.
Athletes should dip their feet in a bucket of ice water for ten minutes then warm/hot water for ten minutes with epsom salt in the warm/hot every night for at least a week. With the ice-they may need to remove their foot often then put back in because it is intense.
Make sure they are properly stretching and conditioning their feet and lower legs. Shown here is an Achilles and calf stretch. And check out the Ankle Drills and Conditioning Poster here, https://www.cafepress.com/gymnasticsstuff/680849
And proper landing mechanics are a must. Look at the USAG Safety Manual for proper landing, they finally got it right. landing from a jump is different than landing from a tumbling pass or dismount.
And here’s a great landing mechanics article from the NSCA. http://myweb.facstaff.wwu.edu/chalmers/PDFs/Landing%20mechanics.pdf
Listen to Karen Goeller’s podcast on this topic anywhere you get podcasts!