These are classified under 手技 (てわざ) tewaza or "hand/arm methods".
There are four simple methods of unbalancing:
(1) 手技 (てわざ) - Tewaza; "Hand/arm method".
(2) 体技 (たいわざ) - Taiwaza; "Body method".
(3) 腰技 (こしわざ) - Koshiwaza; "Hip method".
(4) 足技 (あしわざ) - Ashiwaza; "Foot/leg method".
The first is 掬い投げ (すくいなげ) sukuinage, "scooping throw", which indicates the bent, scooping movement made with the arm.
The second is 小手投げ (こてなげ) kotenage "forearm throw", which indicates the area which traps the opponent's arm.