Tamiya do UJ's for the Frog, solve your popping out problem.
http://www.stellamodels.com.hk/53908...ts-p-2380.html
There is also a front suspension conversion from CRP
I cannot find a link for you but look at the CRP parts for the Frog on ebay
http://stores.ebay.co.uk/Team-CRP-Vi...4.l1513&_pgn=1
hope some of it is useful info for you