No, Digimon is not considered as digivolves. When a tamer digivolves from a digivolution condition on this card, "When Digimon digivolves" does not trigger.

Q3: If the digivolved from tamer in the digivolution condition of this card, is the digimon treated as digivolved?

No, Digimon is not considered digivolved. The digivolution condition of this card does not trigger "when Digimon is digivolved" when digivolved from tamer.

Data Sources

Official English (Asia) Card Listen.digimoncard.com

Lv.4 Korikakumon      BT18-025  R
Hybrid | Variable | Beast

[Digivolve] [Tommy Himi]: Cost 3/[Kumamon]: Cost 1

<Jamming> (This Digimon can't be deleted in battles against Security Digimon.)

[On Play] [When Digivolving] Until the end of your opponent's turn, 1 of their Digimon with no digivolution cards can't suspend.
(Rule) Trait: Has [Ice-Snow] Type.

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Inherited: <Jamming> (This Digimon can't be deleted in battles against Security Digimon.)

DCG Wikidigimoncardgame.fandom.com

Lv.4 Korikakumon      BT18-025  R
Hybrid | Variable | Beast

[Digivolve] [Tommy Himi]: Cost 3/[Kumamon]: Cost 1

<Jamming> (This Digimon can't be deleted in battles against Security Digimon.)

[On Play] [When Digivolving] 1 of your opponent's Digimon with no digivolution cards can't suspend until the end of their turn.
(Rule) Trait: Has [Ice-Snow] type.

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Inherited: <Jamming> (This Digimon can't be deleted in battles against Security Digimon.)

Official Japanese Card Listdigimoncard.com

Lv.4 ブリザーモン      BT18-025  R
ハイブリッド体 | ヴァリアブル種 | 獣型

「氷見友樹」:コスト3/「チャックモン」:コスト1

≪ジャミング≫
【登場時】【進化時】相手のターン終了まで、進化元を持たない相手のデジモン1体はレストできない。
〈ルール〉特徴:タイプ「氷雪型」を持つ。

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Inherited: ≪ジャミング≫（このデジモンはセキュリティデジモンとのバトルでは消滅しない）

Rulings

Data Sources

Japanese Rulings