I beleive the word your all looking for is "Stooga" short for 'standup booga'.
I dont beleive its a twin tip coz there is rocker shaped into the front and not the back, although diffrences in toe side and heelside are ok if they are the same at both tips> get it?
stooga is great paddle practice coz there is not as much bouyancy on a normal booga and waves are hard to catch But,
If you do just get your back foot on the back corner and you will get a line to trim with,
its really not that hard once you caught the wave
...tho after trimming everything else is not paticulary functional (cuttys, reos, rail to rail) are pretty gumbish unless you specialise.
I know one guy in dunno who rips at it, reos the lot. funny thing is he has no standup back ground which is wierd.
too many surfers anyway, its too hard and every one should just give up