i think you have a young roller pigeon mix maybe there, just from what ive seen so far of it, as had a pair father was showier colored roller, and mother was donek or middle easterm performing pigeontumbler type mix, and most of their babies came out looking just like what i can see from your photo. so if it starts back flipping, barrel rolling, or diving, ect. in air around you dont worry.
i have parlor tumbler and they are similar to the airial rollers like birmingham rollers ect, and more so to parlor rollers that roll on ground were they jump or fly up and bacl flip back down right away withing a couple feet of the ground.
these are similar and like how some of mine tumble. birm, american one other, the name i forget, and parlor rollers, and parlor tumblers, all look pretty basic in general and are bred more for and judged on performance only coming in many to any look size shape and color. course there are show rollers and tumblers and of all the differant types of pigeons, that dont home or perform (roll, tumble, barrel roll, dive, soar without flapping, fly for many hours or days on end, fly extreamly high, ect..) at all, except: parlors/parlours (if any one has parlors that dont jump/fly up under to two feet and tumble, or roll around or straight back on ground, after one to about three, maybe six months old, its not a parlor, though young parlors can fly, and actually supposedly well bred parlors fly good and roll better for it when mature and come into roll or tumble). im right now on my first batch of parlor tumbler squeakers, that are just feathering in, so not sure from much personal experiance yet. one squeaker however till recently was rolling right out of the egg, till i started to tame it down so wouldnt freak every time i putzed around it.