"The Frog upgrade." Samus selected. She was still wondering just why the computer had so many upgrades like the Rabbit one. She just couldn't see why the A.I. had decided to make those at all. She took the chip from the machine and once again inserted it into her zero suit.

Samus' thighs began to grow, her ass expanding along with her legs, widening into a pear shape as her rear grew bigger and rounder, her thighs and calves thickening and stretching, her legs becoming longer and much stronger, Samus feeling like she could jump across the room with tree-trunk like legs. The boot on her feet disappeared, her toes tingling as the fabric wrapped around them. The tingling grew more intense as her toes grew longer,  her toes merging together into three large ones, equal in size and long in length.  The heel of her feet lengthened as her foot re-jointed itself, making it had to stand on.

Her hips down were massive as Samus almost fell forward, holding her hands upright to maintain her balance as she looked down at her lower body, almost disproportionally sized on her otherwise slim frame, Samus struggling to remain upright as it seemed to favour a posture on all fours. She felt a familiar tingling on her hands, turning her head to look at them as her fingers grew slightly longer, her fingers merging together to form three large ones and an equally sized thumb.

Samus made the mistake of moving her hands to look at them, and toppled over, unable to keep herself up on her oddly jointed feet. She pushed herself easily into a position on all fours, her front dipped forward as her enormous behind was stuck into the air, a position that Samus found very natural in her new form. Her mouth felt strange as Samus made a strange four-legged walk over to the mirror, examining herself.

As she watched, her skin faded to a light blue, almost the same colour as her suit, as the whites of her eyes changed to a blood red colour. Her nose broadened and flattened, only a small bump as her nostrils also flattened.  Her changes complete, Samus opened her mouth, but only a "Bwah?" came out as a long tongue rolled out, almost a foot and a half, flicking around as Samus tried to pull it back into her mouth.
"I suppose this could be-" Samus managed to get out, before her tongue rolled out again, cutting her off.